Casimir III, also known as Casimir the Great, was the King of Poland from 1333 to 1370. He was known for his efforts to strengthen and expand the Kingdom of Poland, as well as for his support of culture and the arts. Casimir III is remembered for his policies that promoted economic development, trade, and the growth of cities. He also worked to improve the legal and administrative systems of Poland. Casimir III's reign is considered a period of prosperity and stability for Poland, and he is often regarded as one of the most successful and influential monarchs in Polish history.