In 1435 Wąsosz was purchased by Duke Władysław I of Płock.[2] It received Chełmno municipal rights from Duke Władysław I on 13 May 1436, and lost them in 1870 under the Russian rule following the Partitions of Poland. In 1605 local burgher Andrzej Rogala founded a Carmelite monastery.[2] The already well-developed town was destroyed in the Swedish Deluge of 1655-1656 and then rebuilt. The town hall was erected in 1789. Almost all of the streets were paved at around the same time. The town lost its importance due to the development of the nearby town of Szczuczyn and the bypassing of Wąsosz by a new route connecting Warsaw and Kowno.[2] The Carmelite monastery was closed in 1864 by the Tsarist authorities in reprisal for help offered by monks to victims of the January Uprising. They were sent to Katorga chained by the neck.[3]
One of the most impressive points of interest in Wąsosz is its late Gothic church from 1508, with three altars adorned with religious paintings. It is at the Old Market Square.[3] There is also a Baroque Church of the Nativity of the Virgin Mary from the early 17th century.
^ abcdSłownik geograficzny Królestwa Polskiego i innych krajów słowiańskich, Tom XIII (in Polish). Warszawa. 1893. p. 177.{{cite book}}: CS1 maint: location missing publisher (link)
^Bender, Sara (2013). "Not Only in Jedwabne: Accounts of the Annihilation of the Jewish Shtetlach in North-eastern Poland in the Summer of 1941". Holocaust Studies. 19 (1): 1–38. doi:10.1080/17504902.2013.11087369.
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