12th Century
| Year | Date | Event |
|---|---|---|
| 1102 | 4 June | Death of Władysław I Herman |
| 1138 | 28 October | Death of Bolesław III Wrymouth; birth of Casimir II the Just |
| 1173 | 5 January | Death of Bolesław IV the Curly |
| 1182 | The first Sejm | |
| 1194 | 5 May | Death of Casimir II |
Read more about this topic: Timeline Of Polish History