Sieradz AUDPl-Sieradz.ogg'śe1rac (Siradia, שעראַדז, שערעדז, שעריץ, 1941-45 Schieratz) is a city on the Warta river in central Poland with 40,891 inhabitants (2021). It is the seat of the Sieradz County, situated in the Łódź Voivodeship. Historically it was the capital of one of the minor duchies in Greater Poland. It is one of the oldest cities in Poland. Sieradz was an important city of medieval Poland, thrice being a location for the election of the Polish monarchs. Polish Kings chaired six assemblies from here. The oldest settlements can be roughly traced back to the 6th century. The oldest known mention of Sieradz comes from the Bull of Gniezno from 1136. In the mid 13th century it was conferred with municipal rights by Duke Casimir I of Kuyavia. It had also welcomed many settlers from Scotland and the Netherlands after the 13th century. During the fragmentation of Poland, initially it was part of the Seniorate Province, and then from 1231 it was the capital of the Duchy of Sieradz, which in 1339 was transformed into the Sieradz Voivodeship of Poland. Polish king Casimir III the Great erected a castle in Sieradz. In the Middle Ages the town was attacked by the Mongols during all three Mongol invasions of Poland, Bohemians and Teutonic Knights. Sieradz was a significant royal town of Poland. In 1445 the election of King Casimir IV Jagiellon took place in Sieradz. Until the 16th century the town used to be an important trade centre. Merchants from Spain and Portugal were frequently visiting the town for trade and commerce. In the 17th century due to the Swedish invasions, plagues, fires and floods the town lost its trading importance and fell from its prime. In the 18th century the reconstruction of town commenced. The residents during that time were only approximately 1,500. Sieradz was annexed by Prussia in the Second Partition of Poland in 1793. On 13 November 1806 a Polish uprising against the Prussians took place in Sieradz, and in 1807 it was included in the short-lived Polish Duchy of Warsaw.