Nyasvizh or Nesvizh is a town in Minsk Region, Belarus. It serves as the administrative centre of Nyasvizh District. Nyasvizh is the site of Nesvizh Castle, a World Heritage Site. In 2009, its population was 14,300. As of 2025, it has a population of 15,909.
Prince Antoni Henryk Radziwiłł (Polish pronunciation: [anˈtɔɲi ˈxɛnrɨk raˈd͡ʑiviww]; 13 June 1775 – 7 April 1833) was a Polish and Prussian noble, aristocrat, musician, and politician. Initially a hereditary Duke of Nieśwież and Ołyka, as a scion of the Radziwiłł family he also held the honorific title of a Reichsfürst of the Holy Roman Empire. Between 1815 and 1831 he acted as Duke-Governor (Polish: książę-namiestnik, German: Statthalter) of the Grand Duchy of Posen, an autonomous province of the Kingdom of Prussia created out of Greater Polish lands annexed in the Partitions of Poland.