Alexius 1143 Manuel succeeds John II 1146 Second Crusade 1148 Collapse of the Second Crusade 1180 Death of Manuel. Isaac Angelus emperor. Alexius Angelus deposes Isaac. 1202 Fourth Crusade assembles at Venice, diverted at Constantinople 1203 First capture of Constantinople. Second capture and sack of Constantinople.
Crusaders divide the spoils, Venice taking the lion's share.
Baldwin killed in Bulgarian war. Henry of Flanders succeeds. Theodore Lascaris Greek emperor at Nicaea 1216 Death of Henry of Flanders. Accession of Peter of Courtenay 1222 John III Ducas emperor at Nicaea 1229 John of Brienne joint emperor with Baldwin II of Courtenay at Constantinople 1237 Advance of John III Ducas in Thrace. Death of John of Brienne 1246 John III Ducas takes Thessalonica 1254 Death of John III Ducas.