Rokantiškės Castle was located east of Vilnius on a high hill near the Vilnia River. First castle was built in 12th century. In 16th century, it was rebuilt in the Renaissance style and has been the seat of the Olshanski family. Alexander Olshanski, Yuri Olshanski and the last family member Pawel Olshanski have lived there. After his death the castle was inherited by Bona Sforza and later passed to the Pac family. The Deputy Chancellor of Lithuania Stefan Pac was visited here by the King of Poland and Grand duke of Lithuania Władysław IV Vasa on July 15, 1636.
The castle was burnt down by Cossacks on August 7, 1655 during the Russo-Polish War and fell in ruins. Today there are the only visible medieval castle ruins in Vilnius.
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.