From the early 15th century until 1716, Koło was the meeting place of the Provincial Parliament called "Sejmik Generalny" for the Greater Poland region, comprising the Poznań Voivodship, Kalisz, Sieradz, Łęczyca, Brześć Kujawski and Inowrocław Voivodeships. The town evolved into a regional hub of trade and crafts especially in metals and textiles, and as a centre of pottery. In 1571 a contract was drafted with regard to the status of the Jews in Koło, in which the city's Christians have undertaken to provide protection to the Jews, in return for which the Jews were required pay a special annual municipal tax.