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| Baldwin I | |
|---|---|
| Emperor and Autocrat of the Romans | |
 | |
| Latin Emperor of Constantinople Claimant Roman Emperor | |
| Reign | 1204–1205 |
| Coronation | 16 May 1204 (Hagia Sophia) |
| Successor | Henry of Flanders |
| Count of Flanders | |
| Reign | 1194–1205 |
| Predecessor | Margaret I and Baldwin VIII |
| Successor | Joan |
| Count of Hainaut | |
| Reign | 1195–1205 |
| Predecessor | Baldwin V |
| Successor | Joan |
| Born | July 1172 Valenciennes, Hainaut, Kingdom of France |
| Died | c. 1205 (aged about 32–33) Tarnovo, Bulgaria (now Veliko Tarnovo, Bulgaria) |
| Spouse | Marie of Champagne |
| Issue | |
| House | House of Flanders |
| Father | Baldwin V, Count of Hainaut |
| Mother | Margaret I, Countess of Flanders |
| Religion | Latin Catholic |
Baldwin I (Dutch: Boudewijn; French: Baudouin; July 1172 – c. 1205) was the first Emperor of the Latin Empire of Constantinople; Count of Flanders (as Baldwin IX) from 1194 to 1205 and Count of Hainaut (as Baldwin VI) from 1195 to 1205. Baldwin was one of the most prominent leaders of the Fourth Crusade, which resulted in the sack of Constantinople in 1204, the conquest of large parts of the Byzantine Empire, and the foundation of the Latin Empire. The following year he was defeated at the Battle of Adrianople by Kaloyan, the emperor of Bulgaria, and spent his last days as a prisoner.