The St. Václav Church was founded by a duke Břetislav I on the place of lake St. Kosma and Damian Little Church where St. Václav was killed in front of it.
New church was consecrated already in 1046. During 12th century the church was rebuilt into a three wings basilica. Only its crypt is preserved.
The St. Kliment Little Church is one of the oldest cathedral constructions in Bohemia from 11th century with preserved paintings from the second half of 12th century.