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| 1520 | Birth |  |
| Birth of Sigismund II Augustus , son of Sigismund I |
| 1530 | Coronation | |
| Crowned co-ruler with father Sigismund I |
| 1548 | Succession | |
| Warsaw Succeeds as King of Poland |
| 1561 | Unification | |
| Unites Livonia with the Duchy of Lithuania |
| 1567 | Constitution | |
| 4th July Lublin Sigismund II Augustus signs the Act of Lublin |
| 1567 | Rule of Kiev | |
| Kiev Orders the incorporation of southern Lithuanian-controlled lands of Podlachia, Volhynia, Podolia & Kiev regions |
| 1567 | Rule of Podlachia | |
| Podlachia Orders the incorporation of southern Lithuanian-controlled lands of Podlachia, Volhynia, Podolia & Kiev regions |
| 1567 | Rule of Podolia | |
| Podolia Orders the incorporation of southern Lithuanian-controlled lands of Podlachia, Volhynia, Podolia & Kiev regions |
| 1567 | Rule of Volhynia | |
| Volhynia Orders the incorporation of southern Lithuanian-controlled lands of Podlachia, Volhynia, Podolia & Kiev regions |
| 1567 | Unification | |
| Lublin Orders the incorporation of southern Lithuanian-controlled lands of Podlachia, Volhynia, Podolia & Kiev regions |
| 4th July Lublin Sigismund II Augustus signs the Act of Lublin |
| 1567 | Union Lublin | |
| 4th July Lublin Sigismund II Augustus signs the Act of Lublin |
| 1569 | Constitution | |
| 1st July Lublin The Commonwealth is ruled by an elected monarch carrying out the duties of Polish King & Grand Duke of Lithuania |
| 1st July Lublin Under the Union of Lublin the Monarch will govern with a common Senate and parliament (the Sejm) |
| 1569 | Rule of Ukraine | |
| Ukraine Incorporates the Ukranian provinces into Poland |
| 1569 | Unification | |
| Lublin Constitutionally unites all lands under the Polish crown |
| Lublin Incorporates the Ukranian provinces into Poland |
| 1569 | Union Lublin | |
| 1st July Lublin The Commonwealth is ruled by an elected monarch carrying out the duties of Polish King & Grand Duke of Lithuania |
| 1st July Lublin The Union of Lublin strengthens the Polish-Lithuanian Commonwealth by uniting Poland & Lithuania |
| 1st July Lublin Under the Union of Lublin the Monarch will govern with a common Senate and parliament (the Sejm) |
| 1572 | Death | |
| Death of Sigismund II Augustus , dies without an heir, last of the Jagiellon line |
