St Kentigern's Church is a scheduled monument in Lanark, South Lanarkshire. It is believed that the church was founded by St Kentigern himself shortly before his death in 603 AD. There is documentary evidence of its existence, however, dating back to 1150 AD when King David I granted it to the monastery of Dryburgh. Pope Gregory VIII took the church into his own protection in 1228.
The architecture of the present church is 13th century and the site is known to have been occupied by a previous church. The church, which was once attended by William Wallace, is now in a state of disrepair, despite having had repair work completed recently.
The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.