Casimir III the Great
He transformed a fractured medieval kingdom into a prosperous European power through legal reform, territorial expansion, and cultural patronage.
1310–1368 (age 58)·King of Poland from 1333 to 1370·Birthday: April 30
Biography
Casimir III inherited a Poland weakened by internal strife and external threats. Over his long reign, he proved a masterful statesman, securing borders through shrewd diplomacy and military campaigns that doubled the kingdom's size. His most enduring legacy was the codification of Polish law, a unified statute that brought order and justice to his subjects. He actively encouraged Jewish settlement, granting protections that made Poland a haven, and founded the University of Krakow, central to the nation's intellectual life. By his death in 1370, he left behind a stable, respected, and significantly enlarged state, earning his posthumous honorific 'the Great' not through conquest alone, but through foundational governance.
#1 When Casimir Was Born
The biggest hits of 1310
Casimir's Life & Times
The world at every milestone
1310Born
1315Started school
1323Became a teenager
1326Could drive
1328Could vote
1331Turned 21
1340Turned 30
1350Turned 40
1360Turned 50
1368Died at 58
Key Achievements
- Codified Polish common law into a single statute, bringing unprecedented legal unity to the kingdom.
- Founded the University of Krakow in 1364, one of the oldest universities in Central Europe.
- Greatly expanded Polish territory through diplomacy and war, notably incorporating Red Ruthenia.
- Issued protective statutes for Polish Jews, encouraging migration and establishing a long-standing community.
Did You Know?
He was the last Polish monarch from the native Piast dynasty, which had ruled for over four centuries.
A saying from his era, that he 'found a Poland of wood and left one of stone,' speaks to his building programs.
He had no legitimate male heir, leading to his nephew, Louis of Anjou, succeeding him and beginning a personal union with Hungary.
“I found a Poland made of wood and left one made of stone.”
