| YEAR | DATE | EVENT | HEAD OF STATE |
| 1313 | Duchy - dinasty Piasti | duke Wanko | |
| 1336 | duke Boleslao III | ||
| 1351 | duke Siemowit III duke of Masovia | ||
| 1381 | duke Siemowit IV duke of Masovia | ||
| 1425 | duke Trojden II | ||
| 1427 | duke Ladislao I | ||
| 1455 | duke Siemowit VI | ||
| 1462 | duke Ladislao II | ||
| 1462 | duke Corrado III duke of Masovia | ||
| 1471 | duke Casimiro III | ||
| 1480 | duke Boleslao V | ||
| 1488 | duke Janusz II | ||
| 1495 | Union to Duchy of Masovia |