Adulis Harbor Slides Adulis Harbor Slides
Aksum: The Crossroads of the Ancient World
The Discovery
HOOK
"Deep in the soil of modern-day Ethiopia and Eritrea, archaeologists found something strange: gold coins from the Roman Empire and silver from ancient Persia."
How did they get there?
Aksum was not an isolated kingdom.
It was the "middleman" of the ancient world.
The Red Sea was their highway.
The Gateway: Port of Adulis
Strategic Location
Located on the Red Sea coast, Adulis was the primary port of the Aksumite Empire. It connected the African interior with the Indian Ocean and the Mediterranean.
Trade Routes
• North: To the Roman Empire
• East: To India and Persia
• South/West: Deep into Africa
"Adulis: The port where the world met Africa."
Evidence in Gold: Aksumite Coins
Fun Fact
Aksum was the first sub-Saharan African state to mint its own gold, silver, and bronze coins!
Why Mint Coins?
• Easier for international trade
• Shows off the King's power
• Proves a organized economy
Obverse
Image of the King
Reverse
Wheat (Wealth/Growth)
"The coins featured Greek writing—the international language of trade at the time!"
The Shopping List: Exports & Imports
Exports (Leaving Africa)
Ivory (elephant tusks)
Frankincense & Myrrh (incense)
Hides (animal skins)
Gold & Emeralds
Imports (Arriving in Africa)
Silk & Linen (from India/Rome)
Olive Oil & Wine (from Mediterranean)
Iron Tools & Glassware
Spices (from India)
Coinage & Commerce Worksheet Coinage & Commerce Worksheet
Investigating Aksumite Trade through Archaeological Evidence
NAME:
DATE:
Part 1: The Aksumite Gold Coin
Obverse (Front)
Reverse (Back)
The coin features King Endubis (c. 270 AD). The text around the edge is written in **Greek**.
1. Why would an African king put Greek writing on his coins instead of his own local language (Ge'ez)?
2. What does the existence of "Gold Coins" tell us about the wealth of Aksum compared to a barter system?
Part 2: The Aksum Trade Log
Imagine you are a customs officer at the **Port of Adulis**. Match the goods to their origin or destination based on archaeological evidence.
Goods from the Interior
Ivory (Elephant Tusks)
Gold Dust
Frankincense
PORT OF ADULIS
(Red Sea)
Arriving from Overseas
Silk (from India)
Glass (from Rome)
Wine (from Greece)
3. A ship arrives with Indian Spices and Roman Glassware. What two African items might they want to take home in exchange?
Part 3: Critical Thinking
Archaeologists found Aksumite coins in South India. What does this prove about the Aksumite navy and their knowledge of the ocean?
Trader's Log Teacher Guide Trader's Log Teacher Guide
Lesson 1
Aksum: The Crossroads of Trade
Learning Objectives
Analyze physical artifacts (coins) as primary sources.
Map the flow of goods through the port of Adulis.
Evaluate Aksum's status as a global maritime power.
Key Vocabulary
ADULIS AKSUMITE COINAGE MARITIME GE'EZ
Instructional Flow
01
The Hook (10 mins)
Ask: "If you found a modern US quarter in a castle in Germany, what would that tell you?" Pivot to Roman/Persian coins found in Ethiopia. Use the slides to showcase the port of Adulis.
02
Artifact Analysis (15 mins)
Distribute the Coinage & Commerce Worksheet . Have students look closely at the coin imagery. Explain that Greek was the 'lingua franca' of the time (like English is today for business).
03
Trade Mapping (15 mins)
Use the slides to list exports and imports. Challenge students to think about WHY ivory was so valuable (jewelry, piano keys, art) and how Aksum controlled the flow from central Africa.
Discussion Prompts
Prompt A: "How does having a navy and a port make a kingdom different from one that is landlocked?"Prompt B: "Why is coinage a better 'stamp of power' than just trading bags of gold dust?"Prompt C: "If Aksum fell, what would happen to the trade between Rome and India?"
Worksheet Key Points
Greek Writing on Coins:
To make the coins usable and recognizable by international traders from Rome and Greece. It proves Aksum was looking outward to global markets.
Aksumite Navy Proves:
They understood monsoon winds, navigation, and had the engineering to build ships that could cross the Indian Ocean (thousands of miles).
Monolith Maker Slides Monolith Maker Slides
The Engineering Secrets of the Aksumite Stelae
The 160-Ton Problem
HOOK
160 Tons!
(= about 30 African Elephants)
How do you move it?
The largest Aksumite stelae (obelisks) were carved from a single block of granite. No glue. No segments.
Distance
Quarried 4km away from the city center.
Height
Up to 33 meters (approx. 10 stories tall).
Aksumite Tech: Simple Machines
The Lever
Used for prying massive blocks out of the granite quarries.
Rollers (Inclined Plane)
Wooden logs and ramps to transport stone across rough terrain.
Pulley & Ropes
Coordinated manpower to lift the stelae into their standing positions.
"Mathematics and coordination were just as important as muscle power."
The "Stone Skyscrapers"
The stelae weren't just blank rocks. They were carved to look like multistory buildings . This tells us what Aksumite houses actually looked like!
Carved windows and doors
Floor divisions (some show up to 9 floors!)
Carved "monkey heads" (wooden support beams)
False Door
FIELD NOTES
Mission: Stand the Stelae
In your teams, you must design a system to lift a monolith using only the tools available. Think about weight distribution, the "hinge" point, and safety.
Tools
Ropes, Logs, Ramps
Goal
Erect 160 Tons Safely
Stelae Blueprint Activity Stelae Blueprint Activity
ARCHITECT:
EXPEDITION DATE:
Phase 1: Visual Analysis
Look at the drawing of the Aksumite obelisk. Even though it is made of stone, it "mimics" a wooden building. Label the following features on the diagram:
[A] False Door (Ground level)
[B] Windows (Middle levels)
[C] Monkey Heads (Wooden beam tips)
[D] Apex (The rounded top)
Inference Question:
Why did the Aksumites spend so much effort carving these into stone? What does it say about how they valued their architecture?
D
C
B
A
Phase 2: The Erection Strategy
Your team is tasked with lifting a 160-ton monolith. Sketch your plan below. You have **inclined planes (ramps)**, **pulleys (ropes/logs)**, and **gravity (pits)**.
Sketch your ramp and pulley system here.
Step 1: Preparation
How do you prepare the ground to make sure the stone doesn't just sink or slide when you lift it?
Step 2: Force
Where is the most force needed—at the beginning of the lift or at the end? Why?
Step 3: Stabilization
Once it's upright, how do you keep it from falling back over?
Lifting Giants Teacher Guide Lifting Giants Teacher Guide
Lesson 2
Engineering the Obelisks of Aksum
Learning Goals
Explain the mechanical principles used in Aksumite engineering.
Identify architectural features carved into stelae.
Simulate complex lifting problems via teamwork.
STEM Challenge Materials
(For the hands-on simulation)
• Cardboard monolith (10-15cm)
• String (Pulleys/Ropes)
• Pencil stubs (Log Rollers)
• Sandbox or styrofoam base (Foundation)
• Cardboard scraps (Ramps)
Instructional Sequence
1
Architecture as Art (15 mins)
Use Monolith Maker Slides to show the "False Doors" and "Monkey Heads." Explain that these weren't just religious symbols; they were celebrations of their construction style. Have students complete Phase 1 of the worksheet.
2
The Physics of Aksum (15 mins)
Introduce the concept of a "Pivot Point." Discuss how moving 160 tons 4 kilometers uphill requires more than just muscle—it requires an understanding of inclined planes and mechanical advantage.
3
The Simulation (30 mins)
Divide students into "Engineering Teams." Their goal is to stand their cardboard monolith in the sandbox using ONLY the provided tools. Key constraint: They cannot use their fingers to lift the stone directly—they must use ropes and levers.
Facilitation Notes
Students often struggle with the "pit" method. Traditionally, Aksumites may have used a ramp to slide the base of the stone into a pre-dug pit, then used gravity and ropes to pull the top into position. Encourage them to think about how weight can be an ally, not just an enemy.
Common Misconception
"They must have had thousands of slaves."
Actually, many historians believe these were skilled, paid laborers and engineers. The precision of the carving suggests high artistry, not forced toil.
Extension Idea
Have students calculate the weight of the monolith if it were made of Styrofoam vs. Granite. Use basic volume formulas (L x W x H) to show the difference in density.
The Great Enclosure Slides The Great Enclosure Slides
Architecture and Power in Great Zimbabwe
No Mortar. No Glue.
HOOK
Dry-Stone Walling
Engineering Perfection
The walls of the Great Enclosure stand over 11 meters high (36 feet) and are up to 5 meters thick .
How do you build a massive stone wall that stays standing for 800 years without using a single drop of cement?
Mapping Great Zimbabwe
The Hill Complex
Built on a steep rocky hill. The oldest part of the city. Likely the ritual and royal center.
The Valley Ruins
Where the majority of the population lived. Estimated population: 10,000 to 18,000 people!
The Great Enclosure
The most spectacular structure. A massive circular wall protecting a conical tower.
The Conical Tower
Inside the Great Enclosure stands a 10-meter tall stone tower. But here's the mystery: It's completely solid.
What it ISN'T:
• Not a watchtower (no stairs)
• Not a home (no rooms)
• Not a tomb (no bodies)
Hypotheses:
• Symbol of a Grain Silo?
• Symbol of the King's power?
• A giant sundial?
"The Solid Tower"
The Power of Fire and Water
How did they get perfectly rectangular stones? They used thermal expansion .
1. Heat the granite surface with fire.
2. Pour cold water on the hot stone.
3. The stone cracks into flat, usable slabs!
Engineering takeaway:
The builders of Great Zimbabwe didn't just 'pile up rocks.' They used scientific principles to quarry, shape, and stack millions of bricks to build a city of stone.
Stonemason's Secret Worksheet Stonemason's Secret Worksheet
Analyzing the Architecture of Great Zimbabwe
NAME:
DATE:
Part 1: The Dry-Stone Method
The builders of Great Zimbabwe did not use mortar (cement). Instead, they used Dry-Stone Walling . Look at the diagram and answer the questions.
Technique: Coursing
1. Why is it important that the stones are slightly tilted inward as the wall gets higher?
2. If you were building a wall without glue, would you prefer large irregular rocks or small flat bricks? Why?
Part 2: Hypothesizing Function
Area Key Evidence Your Hypothesis (Function?) Hill Complex High elevation, difficult to climb, narrow entry points. Valley Ruins Many small mud and thatch homes (dhaka) outside the walls.
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| Great Enclosure | Massive 36ft walls, 10ft solid tower, private courtyards. |
|
Part 3: The Conical Tower Debate
The Conical Tower is **solid stone**—it has no rooms or stairs. Archeologists believe it may represent a "Grain Silo." In an ancient kingdom, why would a symbol of **food storage** be built inside the King's royal enclosure?
Wall Wisdom Teacher Notes Wall Wisdom Teacher Notes
Lesson 3
The Architecture of Great Zimbabwe
Focus Skills
Observe architectural patterns.
Formulate evidence-based hypotheses.
Analyze structural engineering.
Architectural Vocabulary
MORTAR DRY-STONE CONICAL DHAKA ENCLOSURE
Instructional Guidance
1
The Virtual Tour (15 mins)
"Why are the walls curved?"
Use the slides to show the organic, curving shapes of the walls. Explain that unlike Roman architecture which uses straight lines and arches, Zimbabwe style favors flowing, circular forms that follow the landscape.
2
Scientific Building (15 mins)
Focus on the thermal expansion technique. It highlights the builders' deep understanding of geology and physics. Ask: "How did they know water would crack the rock? This wasn't luck—it was engineering."
3
The Worksheet Challenge (20 mins)
Students use the Stonemason's Secret Worksheet to hypothesize city functions. Note: Encourage them to think about 'Social Stratification'—who lives inside vs. outside the walls?
Hypothesis Guide
Expected answers for the Worksheet Part 2:
Hill Complex:
Defense, Royal Residence, or Religious site (closeness to the sky).
Valley Ruins:
Commercial/Residential area for common citizens; where the economy happened.
The Power of Choice
Remind students that these walls weren't necessarily for war. There are no weapon marks or battle debris. They were likely built for Prestige —to show the world that the Shona people were wealthy enough to build in stone.
Global Treasures Slides Global Treasures Slides
How Great Zimbabwe Connected Africa to Asia
A Piece of China?
HOOK
Fragile
Porcelain Fragment
The Discovery
Archaeologists found shards of Chinese Celadon (green porcelain) and blue-and-white porcelain from the Ming Dynasty inside the Great Enclosure.
Question:
How did a fragile tea bowl travel 5,000 miles from China to a city in Southern Africa?
The Indian Ocean Network
Trade was powered by the Monsoon Winds . They blew toward India in the summer and toward Africa in the winter.
The Swahili Coast
City-states like Kilwa and Sofala were the "ports of entry" where inland African goods were traded for Asian treasures.
The Trade Route:
Great Zimbabwe (Gold/Ivory)
Swahili Coast Ports
India / Persia (Spices/Textiles)
China (Porcelain/Silk)
Glass Beads from Persia
Millions of tiny glass beads have been found at Great Zimbabwe. Chemical testing shows they came from the Persian Gulf and India .
Why Beads?
Lightweight, high-value, used as currency and status symbols.
The Exchange
Beads were traded for **Gold** mined from the hills near Zimbabwe.
Archeological Evidence #402
Gold: The African Heart of Trade
Great Zimbabwe didn't just 'receive' trade. They **drove** it. Their gold mines fueled the economies of India and the Middle East for centuries.
20,000+ Mines
Estimated number of ancient mines in the region.
Coastal Links
Sofala port was the main gateway for Zimbabwe gold.
Global Wealth
African gold minted into coins across Asia and Europe.
Supply Chain Challenge Worksheet Supply Chain Challenge
Tracking the Indian Ocean Trade Network
INVESTIGATOR:
STATION:
Part 1: Identifying the Imports
You are an archaeologist sorting through a "trash pit" (midden) at Great Zimbabwe. Identify the origin of these items based on your lesson notes.
Shards of Celadon Pottery
Light green glaze, very thin and delicate.
Origin: ___________________
Glass 'Eye' Beads
Polished glass, brightly colored, small holes.
Origin: ___________________
Part 2: The Supply Chain Diagram
Fill in the boxes to show how **Gold** moved from the African interior to the rest of the world, and what came back in return.
STEP 1: EXTRACTION
Great Zimbabwe
GOLD / IVORY
STEP 2: THE PORT
Swahili Coast
STEP 2 (REVERSE)
Swahili Coast
Beads / Porcelain
STEP 3: OVERSEAS
Part 3: Analysis
3. Why were the monsoon winds essential for this trade to function? What would happen if a trader missed the 'wind window'?
4. Does the existence of these foreign treasures prove that the people of Great Zimbabwe were "connected" to the world? Why or why not?
Ocean Links Exit Ticket Ocean Links Exit Ticket
NAME:
If an explorer found **Chinese Porcelain** and **Persian Beads** at Great Zimbabwe, but **NO** records of African travel to China, how can we still prove the cities were connected?
"Trade is the language of shared objects."
Duplicate for teacher use / printing
Truth Seekers Slides Truth Seekers Slides
Correcting the Historical Record of Great Zimbabwe
The "Impossible" Walls
HOOK
"It is impossible that Africans built this. They do not have the technology or the organization."
— Early European explorers (1870s)
What is Historical Bias?
When people let their own prejudices change how they report history. Because these explorers believed Africans were "inferior," they invented fake stories to explain the ruins.
The Myths:
• "Built by the Queen of Sheba"
• "Built by Phoenicians"
• "Built by King Solomon"
Archaeology Strikes Back
1. Local Tools
Iron tools found at the site match local Shona designs, not foreign ones.
2. Local Pottery
99% of the pottery found is indigenous African pottery, showing people lived there for centuries.
3. Carbon Dating
Modern science proves the walls were built between 1100 and 1450 AD—long after the "myths" were supposed to have happened.
THE VERDICT
The ruins are 100% African in origin and design.
Restoring History
When we fix the historical record, we acknowledge the intelligence and achievement of ancient African civilizations.
"The stones don't lie. Only people do."
By studying physical evidence, we can protect history from being erased or rewritten by biased explorers.
Critical Question
If someone told you that YOU didn't build your own school project because it was "too good," how would you feel?
This is exactly what colonial historians did to the builders of Great Zimbabwe.
Historical Rebuttal
Time to use your evidence to set the record straight.
Your Mission:
Write a letter to a 19th-century explorer. Use at least **three pieces of physical evidence** (pottery, trade beads, stone techniques) to prove they are wrong.
Evidence vs. Bias Worksheet Evidence vs. Bias Worksheet
Setting the Record Straight on Great Zimbabwe
HISTORIAN:
DATE:
Part 1: The Concept of Bias
The Explorer's Quote (1871):
"It is a mystery who built these walls. It must have been the Phoenicians or perhaps King Solomon from the Bible. The local African tribes could never have created such massive and precise stonework."
1. What is the explorer's main 'bias' or assumption in this quote?
2. Why did he mention famous biblical figures instead of looking at the people already living there?
Part 2: Fact-Checking with Artifacts
Explorer's Claim Scientific/Archaeological Counter-Evidence "The walls were built by ancient Phoenicians 3,000 years ago." EVIDENCE: Carbon Dating
Testing of wood and bone shows the walls were actually built in: ___________
|
| "Africans didn't have the tools to carve such hard granite." |
EVIDENCE: Iron Tools
Describe what archaeologists found in the "Hill Complex" that proves local creation: ____________________________________________________________________
|
| "The city was a lonely outpost for foreign kings." |
EVIDENCE: Local Pottery & Cattle
The presence of millions of cattle bones and Shona pottery proves that: ____________________________________________________________________
|
Part 3: Historical Argument
Write a 3-4 sentence rebuttal to the 19th-century explorers. Use the word **"Artifact"** and the word **"Evidence"** in your argument.
History Rewritten Assessment History Rewritten Assessment
Sequence Final: Aksum & Great Zimbabwe
Assessment Type
Summative Portfolio
Section 1: The Artifact Connection
Match the archaeological find to the empire it identifies (Aksum or Great Zimbabwe) and what it proves.
A
Gold Coin with Greek Text
Empire: __________________
Proves:
B
Dry-Stone Conical Tower
Empire: __________________
Proves:
C
Persian Glass & Chinese Celadon
Empire: __________________
Proves:
Section 2: Synthesis Response
Essential Question: What does the physical evidence of architecture and artifacts reveal about the sophistication and global connections of ancient African societies?
(Write a paragraph response. Include at least one example from Aksum and one from Great Zimbabwe. Mention trade, engineering, or social organization.)
Final Reflection
Why is it dangerous to ignore archaeological evidence in favor of myths or stories? How does science help us find the "true" history of a people?
