Piastoszyn [pjasˈtɔʂɨn] is a village in the administrative district of Gmina Kęsowo, within Tuchola County, Kuyavian-Pomeranian Voivodeship, in north-central Poland.

In 1454, King Casimir IV Jagiellon signed the act of reincorporation of the region to the Kingdom of Poland, what was eventually recognized by the Teutonic Knights in 1466.

[2] Within Poland, Piastoszyn was a royal village of the Polish Crown, administratively located in the Tuchola County in the Pomeranian Voivodeship.

[clarification needed] It is documented, that Franz Lucowicz bought the village from royal starost Michał Antoni Sapieha [pl] in 1753 who gave it to the municipal of Piastoszynlater: He assigned it to Schulz (village major, lat.

[clarification needed] Andreas Behrendt and his wife Helene Elisabeth Patin from Ciechocin had been acknowledged by Polish King Stanisław August Poniatowski as Schulz of Piastoszyn during the same year.