The manor of Ahja was first mentioned in 1553. The current two-storey, Baroque style main building was erected in 1749 by Guillemot de Villebois. Later, the manor belonged to the von Lipharts, von Löwis of Menars and von Brasches. In 1929-97, the building housed a local school. About a kilometre from the manor's centre is a chapel (with a beautiful Neo-Renaissance portal) and family graveyard of the von Brasche's family.
References: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.