John of Nepomuk (or John Nepomucene) (Czech: Jan Nepomucký) (c. 1345 – March 20, 1393) is a national saint of the Czech Republic, who was drowned in the Vltava river at the behest of Wenceslaus, King of the Romans and King of Bohemia.
http://webcatolicodejavier.org/SanJuanNepomuceno.html