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| 1405 | Birth |  |
| 8th Feb Constantinople Birth of Constantine XI Palaiologos, eighth of ten children of Manuel II Palaiologos and Helena Dragas, the daughter of the Serbian prince Constantine Dragas of Kumanovo |
| 1428 | Marriage |  |
| Constantine XI marries Maddalena Tocco, niece of Carlo I Tocco of Epirus , 1st marriage |
| 1429 | Marriage |  |
| Constantine XI marries Caterina Gattilusio, daughter of the Genoese lord of Lesbos, 2nd marriage |
| 1443 | Capture of Athens |  |
| Athens Invades the Duchy of Athens from Morea, conquering Thebes and Athens and forcing its Florentine Duke to pay him tribute, the triumph is short-lived, as the Ottomans intervene & force him back to Morea |
| 1443 | Capture of Thebes |  |
| Thebes Invades the Duchy of Athens from Morea, conquering Thebes and Athens and forcing its Florentine Duke to pay him tribute, the triumph is short-lived, as the Ottomans intervene & force him back to Morea |
| 1443 | Despotes of Morea |  |
| Morea Constantine became the Despotes of Morea (the Medieval name for the Peloponnesus ), which he rules from the palace in Mistra |
| 1443 | Invasion of Greece |  |
| Morea Invades the Duchy of Athens from Morea, conquering Thebes and Athens and forcing its Florentine Duke to pay him tribute, the triumph is short-lived, as the Ottomans intervene & force him back to Morea |
| 1443 | Succession |  |
| Morea Constantine became the Despotes of Morea (the Medieval name for the Peloponnesus ), which he rules from the palace in Mistra |
| 1448 | Succession |  |
| Ottoman Sultan Murad II to arbitrates between Constantine & his brother Demetrios Palaiologos & decides in favour of Constantine |
| Succeeds as Emperor of the Eastern Roman Empire, the last Emperor of the Byzantine Empire |
| 1449 | Coronation |  |
| 6th Jan Mistra Crowned as Emperor of the Eastern Roman Empire |
| 1452 | Council Florence |  |
| Florence The union between the Roman & Greek Churches is overwhelmingly rejected by his subjects and it dangerously estranged him from his chief minister and military commander, the Megas Doux Loukas Notaras |
| 1453 | Capture of Constantinople |  |
| 29th May Constantinople Captured by the Ottomans under Mehmed II, Constantine dies at the city gates in it's defense |
| 29th May Constantinople Mehmed II offers Constantine XI the chance to rule in Mistra before the siege of Constantinople but he refuses & dies during it's defense |
| 1453 | Death |  |
| 29th May Constantinople Death of Constantine XI, defending Constantinople from Mehmed II |