The current church building in Govan was constructed in 1888, although the site is one of the oldest places of Christian worship in Scotland. Unusually, the axis of the church was turned to orientate north-south rather than the traditional east-west orientation, but this allowed the main door to face south to the main street. It is believed that the site's earliest Christian activity began sometime in the 6th century AD. Archaeological excavations in the 1990s uncovered two early Christian burials beneath the foundations of a later church. Despite this early activity, it wasn't until the 9th and 10th centuries that Govan Old rose to prominence.
The church now houses a remarkable collection of early Christian stones, The Govan Stones. They are an unique collection of early medieval stones carved in the 9th – 11th centuries to commemorate the power of those who ruled the Kingdom of Strathclyde. 31 monuments dating from this period include beautifully carved crosses and cross shafts, and 5 magnificent hogback stones.
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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.