Knyszyn [ˈknɨʂɨn] (Yiddish: קנישין, romanized: Knishin, Lithuanian: Knišinas) is a town in the Podlaskie Voivodeship, in north-eastern Poland, 26 kilometres (16 miles) northwest of Białystok.

[2] Knyszyn was the favorite residence of the King, and was the Polish court's main base for hunting expeditions into the nearby virgin forests.

Sigismund II died in the town in 1572, after which the royal property rapidly fell into neglect.

Few signs of the former royal residence and extensive studs remain aside from foundations, which are poorly marked.

According to a legend, the heart of King Sigismund II is buried in the underground crypts of the church of St. John, which was built in the years 1579-1601 by the Great Crown Hetman Jan Zamoyski,[3] who became starost of Knyszyn in 1574.

In 1630, Polish prince and soon-to-be King Władysław IV Vasa stayed in Knyszyn.

At that time, many Jews settled in Knyszyn,[4] as a result of the discriminatory Russian regulations (Pale of Settlement), while the Polish population was subject to repressions and Russification policies.

In 1719 an agreement was reached between the Jewish community and the Church, requiring the former to pay a tax annually, with additional levees on several holidays.

The above is from https://kehilalinks.jewishgen.org/Knyszyn/occupation.html Knyszyn is reportedly the birthplace of the Knish, a traditional Ashkenazic Jewish dish of flaky pastry filled with mushrooms, mashed potato, or other savory items.