Casimir the great and poland

Casimir the great was the only Polish king to be named The Great . The was the son of Wladyslaw he was a great king. He improved Poland a good deal. He improved the military, the law and the economy. He extended Poland's borders . Casimir took in persecuted people like Jews,Armenians and gave them equal rights. He had to take care of other foreign powers who wanted Poland like German Teutonic knights , Bohemia, Lithuania and the Mongols.( fun fact the Mongols attacked Indonesia but could not take it ) Casimir made friends with Bohemia , paid of the mongols , the Lithuanians stopped and the Teutonic knights left. When Casimir died he had no heirs , ending the Piast reign. Casimir made his nephew king.