The Bishop's Palace, Kirkwall was built at the same time as the adjacent St Magnus Cathedral. It was built for the cathedral's first bishop, William the Old of the Norwegian Catholic church who took his authority from the Archbishop of Nidaros (Trondheim). The ruined structure now looks like a small castle.
Originally it is thought to have been like a typical Royal Norwegian Palace, with a large rectangular hall above store rooms and a tower house as the Bishop's private residence. King Haakon IV of Norway, overwintering after the Battle of Largs, died here in 1263, marking the end of Norse rule over the Outer Hebrides. The neglected palace had fallen into ruins by 1320.
In 1468 Orkney and Shetland were pledged by Christian I of Denmark and Norway for the payment of the dowry of his daughter Margaret, betrothed to James III of Scotland, and as the money has never since been paid, their connection with the crown of Scotland has been perpetual. In 1526 the palace came briefly into the possession of William, Lord Sinclair, before he was ordered to return it to the Bishop of Orkney. When King James V of Scotland visited Kirkwall in 1540 he garrisoned his troops in the Palace and in Kirkwall Castle. Soon afterwards' extensive restoration was begun by Bishop Robert Reid, the last and greatest of Orkney's medieval Bishops who also founded the University of Edinburgh. Reid added a round tower, the Moosie Toor.
Ownership passed to Robert Stewart, 1st Earl of Orkney, in 1568, then to his son Patrick Stewart, 2nd Earl of Orkney who planned to incorporate it into his Earl's Palace, Kirkwall, but debts forced him to return it to Bishop James Law. Earl Patrick's son Robert seized both palaces in 1614, and a siege followed, though it is not known if this caused damage to the structures, both of which are now ruins.
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.