June – July 1202 : Arrival of the French crusaders in Venice
August 1202: Arrival of Boniface of Montferrat in Venice with German and Lombard troops
11-24 November 1202 : Siege and fall of Zara.
January 1203: Arrival of prince Alexios (IV) Angelos in Zara
February 1203: Agreement for the campaign against Constantinople.
April 1203: Arrival in Corfu.
23 June 1203 : Arrival before Constantinople.
5 July 1203 : Break of the chain of the Golden Horn and landing of crusaders in Galata.
17 July 1203 : Approaching the Byzantine capital.
17-18 July 1203 : Flight of Alexios III Angelos from Constantinople.
18 July 1203 : Blinded Isaac II Angelos on the throne again.
1 August 1203 : Coronation of Alexios IV Angelos.
November 1203: The dissatisfaction of the inhabitants of Constantinople increased.
December 1203: Outbreak of hostilities between the Byzantines and the crusaders.
End of January 1204: Revolt at Constantinople.
9 April 1204 : First attempt of an assault against Constantinople.
12 April 1204 : Second arrival of the crusaders before the city walls.
13 April 1204 : The crusaders occupied Constantinople.