The earliest records of Kellie go back to 1150 where it is mentioned in a charter issued by King David I. The first known owner was Robert of London, the illegitimate son of King William the Lion. None of the early buildings to have survived.
The estate was signed over to a Siward relative, Walter Oliphant, in 1360 and the castle remained in the ownership of the Oliphant family until 1613. It was purchased by Sir Thomas Erskine, who had saved the life of King James VI during the Gowrie Conspiracy. The King stayed at Kellie in 1617 during his only visit to Scotland after the Union of the Crowns, and he appointed Erskine as Earl of Kellie in 1619.
Originally a simple tower house, the lower section of what now constitutes the northwest tower is the oldest part of the castle, dating from around 1360, and is said to be haunted. In 1573 a new tower was built by the 4th Lord Oliphant to the east of the original tower. It is believed that the 4th Lord built the east tower as a jointure-house (a property set aside for the wife after the husband's death) for his wife Margaret. Between 1573 and 1606 the two towers were linked by a new range, terminated by another tower in the south-west, creating the T-plan layout that remains today. The castle is a fine example of Scots Baronial domestic architecture, with an imposing mix of gables, corbelled towers, and chimneys.
The walled garden is 17th century, with late Victorian additions, contains a fine collection of old-fashioned roses, fruit trees and herbaceous plants.
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.