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In 1631, Leszno was vested with further privileges by King Sigismund III Vasa, who made it equal with the most important cities of Poland such as Kraków, Gdańsk and Warsaw. By the 17th century, the town had a renowned Gymnasium (school), which was headed by Jan Amos Komenský (known in English as Comenius), an educator and the last bishop of the Unity of the Brethren. Johann Heermann, a German-speaking poet, lived in Leszno from 1638 until his death in 1647. Between 1636 and 1639, the town became fortified and its area increased.