 The existence of an original fortress on the site of today's château is assumed from sometime around the middle of the 14th century.It was built on a rocky granite outcrop, which, after the damming of a stream and the filling up of a fishpond, became an island.The first written source is an entry into the land records from 1465, mentioning the division of the property of deceased Ctibor of Zásmuk between his two sons Petr and Václav.