Portaferry Castle is a small tower house in built in the 16th century by William Le Savage. In 1635, Patrick Savage's brother-in-law, Sir James Montgomery of Rosemount (Greyabbey), repaired the castle by roofing and flooring it so that his sister could live in greater comfort there.
It is a square building with a small projecting turret on the south corner. It is three storeys high plus attic and there is no vault. Most of the eastern corner is in ruins. The entrance at the base of the tower is protected by a small machicolation and the entrance to the ground floor chamber is protected by a murder-hole. A curved stairway within the tower rises to the first floor and a spiral stairway in the west corner continues to roof level.
References:Doune Castle was originally built in the thirteenth century, then probably damaged in the Scottish Wars of Independence, before being rebuilt in its present form in the late 14th century by Robert Stewart, Duke of Albany (c. 1340–1420), the son of King Robert II of Scots, and Regent of Scotland from 1388 until his death. Duke Robert"s stronghold has survived relatively unchanged and complete, and the whole castle was traditionally thought of as the result of a single period of construction at this time. The castle passed to the crown in 1425, when Albany"s son was executed, and was used as a royal hunting lodge and dower house.
In the later 16th century, Doune became the property of the Earls of Moray. The castle saw military action during the Wars of the Three Kingdoms and Glencairn"s rising in the mid-17th century, and during the Jacobite risings of the late 17th century and 18th century.