Saint Mary, the mother of Jesus Christ
(Nepomuk c. 1345 - Praha 1393), confessor of the queen of Bohemia, refused to divulge the secrets of the confessional. At the behest of King Wenceslaus of Bohemia he was thrown from the Charles Bridge in Prague and drowned. John of Nepomuk is patron saint of bridges (Wikipedia)
The monumental late Baroque palace, one of the most beautiful ones in Prague, was built in 1755-65 by A. M. Lurago for Count Jan Arnošt Golz. The rich stucco decorations of the façade in Rococo style were made by C. G. Bossi, the statues of Ancient Greek gods on the attic are by I. F. Platzer.