What Happened in 1203
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- Jul 17 Siege of Constantinople begins during the fourth Crusade; Roman Catholic Crusaders aboard a Venetian fleet attack the city
- Aug 1 Alexius IV Angelus appointed co-regent of Byzantium
- Nov 4 Dirk VII, Count of Holland (1190-1203), dies
- F 1
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- S 3
- M 4
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List of Years
Gregory I
Gregory XIII
Julius II
Julius III
Leo X
Pius V