1. Leadership
1.1. Divinity in leadership
1.1.1. Mesopotamian Kings
1.1.2. Egyptian Pharoah
1.1.3. Roman Emperor (Pre-Christianity)
1.1.4. Byzantine Emperor
1.1.5. Chinese Dynasties
1.2. Secular
1.2.1. Post-Christianity Roman Emperors
1.2.2. Medieval Kings
1.3. Religious
1.3.1. Pope
1.3.2. Patriarch of Constantinople
1.3.3. Caliph
2. Trade
2.1. Maritime Routes
2.1.1. River Trade
2.1.2. Mediterranean Sea
2.1.3. Black Sea
2.1.4. Aegean Sea
2.2. Land Routes
2.2.1. Silk Road
2.2.2. Tran-Saharan Caravans
2.3. Cities
2.3.1. Constantinople
2.3.2. Rome
2.3.3. Alexandria
2.3.4. Athens
2.4. Spread of Culture
2.4.1. Language
2.4.1.1. Arabic
2.4.1.1.1. Muslim Empires
2.4.1.2. Greek
2.4.1.2.1. Byzantine Empire
2.4.1.3. Latin
2.4.1.3.1. Roman Empire
2.4.2. Religion
2.4.2.1. Monotheism
2.4.2.1.1. Islam
2.4.2.1.2. Christianity
2.4.2.2. Polytheism
2.4.2.2.1. Mythology
2.4.2.2.2. Paganism
3. Religion
3.1. Polytheism
3.1.1. Mythology
3.1.1.1. Greece
3.1.1.2. Rome
3.1.1.3. Mediterranean
3.1.2. Paganism
3.1.2.1. Germanic Tribes
3.2. Monotheism
3.2.1. Zoroastrianism
3.2.1.1. Persian Empire
3.2.2. Christianity
3.2.2.1. Roman Empire
3.2.2.2. Byzantine Empire
3.2.3. Judaism
3.2.3.1. Hebrews
3.2.4. Islam
3.2.4.1. Umayyad
3.2.4.2. Abbasid
3.2.4.3. Ottoman
4. Resources
4.1. Location
4.1.1. Cities
4.1.2. Drinking Water
4.2. Terrain
4.2.1. Coastline
4.2.1.1. Fishing
4.2.1.2. Trading
4.2.2. Mountains
4.2.2.1. Mining
4.2.2.1.1. Copper
4.2.2.1.2. Gold
4.2.2.1.3. Tin
4.2.3. Fertile Soil
4.2.3.1. Surplus
4.2.3.1.1. Wheat
4.2.3.1.2. Fruits
4.2.3.1.3. Grain
4.2.3.1.4. Dairy
5. Division
5.1. Imperial Bureaucracy
5.1.1. Satrapies
5.1.1.1. Persian Empire
5.1.2. Provinces
5.1.2.1. Roman Empire
5.1.3. States
6. War
6.1. Competition over Resources
6.1.1. Power
6.1.1.1. Alexander the Great
6.1.2. Money
6.1.3. Land
6.1.3.1. Persian War
6.1.3.2. 100 Years' War
6.1.4. Location
6.1.4.1. Punic Wars