Pelplin Abbey is a former Cistercian abbey founded in 1258 by Sambor II, Duke of Pomerania. It was a daughter house of the Cistercian Doberan Abbey. It was first sited in Pogódki (Pogutken) near Kościerzyna (Berent) and re-located in 1276 to Pelplin. By decree of the Prussian government of 5 March 1823 it was dissolved. Since 1824 the church, as Pelpin Cathedral, has been the cathedral of the Roman Catholic Diocese of Pelplin. Work on the Brick Gothic building (length 80 m, height 26 m) began in 1289. The church was finished in 1323; additional work was completed in 1557.
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.