The Romanesque Santo Domingo Church was built in the late 12th century above a pre-existing church dedicated to San Tomé, although it was partially renovated in the following centuries, including the century transept and choir area, added in the 16th century when a Dominican convent was founded annexed to the church.
It has a façade with two orders of arcades at the sides of the portal, which is surmounted by a rose window. The portal has an elaborated archivolt with Biblical characters and scenes, including the 24 elders of the Apocalypse, the Massacre of the Innocents, the Youth, the Passion and the death of Christ. The tympanum has representations of the God the father sitting with the Child, four angels with the symbols of the Evangelists, the prophet Isaiah and the Virgin Mary. The capitals on the jambs of the entry feature biblical scenes from the Genesis and the life of Christ.
The interior is on the Latin cross plan with a nave and two aisles, covered by barrel vaults.
References:Celje Castle was once the largest fortification on Slovenian territory. The first fortified building on the site (a Romanesque palace) was built in the first half of the 13th century by the Counts of Heunburg from Carinthia on the stony outcrop on the western side of the ridge where the castle stands. It had five sides, or four plus the southern side, which was a natural defence. The first written records of the castle date back to between 1125 and 1137; it was probably built by Count Gunter. In the western section of the castle, there was a building with several floors. Remains of the walls of this palatium have survived. In the eastern section, there was an enclosed courtyard with large water reservoirs. The eastern wall, which protects the castle from its most exposed side, was around three metres thicker than the rest of the curtain wall. The wall was topped with a parapet and protected walkway.