Sid Meier's Civilization V: Gods & Kings/Byzantium

Byzantium, also known as the Eastern Roman Empire, becoming almost as influential as Rome itself during its peak. Byzantium is led by Theodora, the wife of Justinian I and the Empress of the Byzantine Empire. Byzantium is one of the more flexible civilizations with a strong focus on religion, as its Unique Ability allows for a lot of interesting combinations. Its unique units are similarly well-rounded, decent for any situation.

Unique Ability

 * Patriarchate of Constantinople - Choose an additional belief when founding a religion.

Cataphract

 * Cost: 75 Production / 150 Faith
 * Type: Mounted
 * Combat Strength: 15
 * Movement Points: 3
 * Can move after attacking, 25% combat penalty when attacking cities
 * Prerequisites: 1 Horse, Horseback Riding technology
 * Obsolete with: Chivalry technology
 * Upgrades to: Knight
 * Replaces Horseman
 * Higher combat strength, lower movement points, can gain defensive bonuses, reduced penalty from attacking cities.

Dromon

 * Cost: 56 Production
 * Type: Naval Ranged
 * Combat Strength: 8
 * Ranged Combat Strength: 10
 * Range: 2
 * Movement: 4
 * Cannot enter deep ocean, bonus damage against naval units
 * Prequisites: Sailing technology
 * Obsolete with: Astronomy technology
 * Upgrades to: Galleass
 * Replaces Trireme
 * Higher cost, reduced defensive Combat Strength, gains ranged attack.