1138 AD - Kazimierz Sprawiedliwy was born. Polish ruler.
- Also known as Casimir the Just.
1177 AD - He became the duke of Kraków and of Sandomierz.
- He drove his brother Mieszko III from power at Cracow and became the principal duke of Poland.
1180 AD - At the Congress of Leczyca, the nobility and clergy, in return for privileges he had granted them, vested Casimir's descendants with hereditary rights to the crown.
- Casimir himself was never crowned king.
1194 AD - Died on May 5th.
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