Empire · 1025–1569 · Europe
Kingdom of Poland
Also known as Poland, Poland-Lithuania
Poland emerged under the Piast dynasty, whose duke Mieszko I accepted Christianity in 966; his son Bolesław the Brave was crowned the first king in 1025. After 1138 the realm split into duchies for nearly two centuries and suffered Mongol raids, until Władysław the Short reunited it and his son Casimir the Great rebuilt it, founding the University of Kraków and welcoming Jewish settlers.
In 1386 Queen Jadwiga married Jogaila, Grand Duke of Lithuania, creating a personal union under the Jagiellonian dynasty. The union crushed the Teutonic Knights at Grunwald in 1410 and became one of the largest states in Europe. Power gradually shifted to the nobility through the Sejm, and in 1569 the Union of Lublin turned the partnership into the Polish-Lithuanian Commonwealth.

- Years
- 1025–1569
- Capital
- Gniezno, then Kraków
- Greatest extent
- 1490, about 1.10 million km²
- Region
- Europe
Jagiellonian Poland together with Lithuania in personal union; Poland-Lithuania c. 1.1M km² c. 1480 (Turchin, Adams & Hall 2006)
Legacy
Medieval Poland anchored Latin Christianity in east-central Europe and pioneered a parliamentary noble democracy that later produced Europe's first modern written constitution in 1791.
Rulers
- Mieszko I duke c. 960 – 992
Accepted Christianity in 966
- Bolesław I the Brave 992 – 1025
Crowned first king of Poland in 1025
- Casimir III the Great 1333 – 1370
Rebuilt the kingdom and founded Kraków University
- Jadwiga 1384 – 1399
Queen whose marriage to Jogaila united Poland and Lithuania
- Władysław II Jagiełło 1386 – 1434
Defeated the Teutonic Knights at Grunwald
- Sigismund II Augustus 1548 – 1572
Created the Commonwealth by the Union of Lublin
Realms on the map
- Kingdom of Poland 962–1449
- Kingdom of Poland 962–1449
- Polish-Lithuania Kingdom 1395–1449
- Duchies of Poland 1139–1304
- Duchies of Poland 1279–1304
Wars
- Mongol conquests (1206–1260) 1206 – 3 September 1260