The History of Byzantium

The Latins assault the city and Alexios Angelos Komnenos flees. Alexios Angelos becomes Emperor and empties the treasury into the Crusaders' hands. But when he runs out of money the two sides face an inevitable confrontation.Period: 1203-4

Pope Innocent calls for a new Crusade to retake Jerusalem. A group of French Knights decide to form an expedition to Egypt and make a deal with Venice to transport them. But when they can't pay the bill the mission goes awry and ends up at Constantinople. 

Alexios Angelos faces down one internal rebellion after another as the Roman Empire continues to contract. The biggest threat to his throne comes from disgruntled aristocrats and the people of Constantinople.