Built on a 12th century motte, Myrton Castle is a ruined 16th century L-plan tower house. It rose to four storeys and a garret, within a parapet, and had open rounds at the corner. There was another building at the base of the motte.
It was originally a property of the MacCullochs. Sir Alexander MacCulloch of Myrton torched Dunskey Castle in 1503, and was the King's Master Falconer. James 1V visited in 1504 (and 1511) during a pilgrimage to the shrine of St. Ninian at Whithorn.
The tower was ruined by the late 17th century, and a new house was built nearby. The property was sold to the Maxwells of Monreith. In 1685, who removed to Myrton from nearby Dowies. They altered the building, and a wing was still occupied in the
19th century. The Maxwells built Monreith House close by, which is still occupied.
Wording taken from The Castles of Scotland Third Edition by Martin Coventry