After 1305 part of the united Kingdom of Poland as a vassal duchy, later after 1339 incorporated by the king Casimir III the Great as the Sieradz Voivodship.
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After 1305 part of the united Kingdom of Poland as a vassal duchy, later after 1343 incorporated by the king Casimir III the Great as the Łęczyca Voivodship.
The Jagiellonian University, founded in 1364 by King Casimir III in Kraków, is one of Europe's oldest universities.
King Kazimierz Wielki (Casimir the Great) of Poland founded the prestigious Jagiellonian University in 1364.
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As a potential successor Casimir III the Great on the throne of Poland, Siemowit II agreed to waive the rights of Chełmno and Eastern Pomerania.
When Casimir III the Great died in 1370, under agreements concluded with one of his lifetime friends Siemowit III, he freed Siemowit from Polish suzerainty and gave Płock, Wizna, Wyszogród and Zakroczym back to Mazovia.