| YEAR | DATE | EVENT | HEAD OF STATE |
| 1204 | 12 april | Lordship - dinasty Lascaris | Sire Teodoro I |
| 1206 | Empire | emperor Teodoro I | |
| 1222 | dinasty Duchys | emperor John III | |
| 1255 | 30 october | emperor Teodoro II | |
| 1259 | august | dinasty Paleologi | emperor John IV |
| 1260 | 1 january | emperor Michele VIII Eastern emperor | |
| 1261 | 27 july | Union to Eastern Empire |