The lands of Mugdock were a property of the Grahams from the mid-13th century, when David de Graham of Dundaff acquired them from the
Earl of Lennox. It is possible that the castle was built by his descendant, Sir David de Graham (d. 1376), or by his son in 1372. During the
Bishops' Wars, a prelude to the
Wars of the Three Kingdoms, Montrose briefly supported the
Covenanters. He was imprisoned in Edinburgh in 1641 for intrigues against
Archibald Campbell, 1st Marquess of Argyll, who was to become his arch-enemy. While Montrose was in prison,
Lord Sinclair sacked Mugdock. Montrose returned there, however, until 1644 when he began his Royalist revolt, becoming the King's commander in Scotland. Mugdock was sacked again that year. Following the defeat of
Charles I, Montrose was executed in 1650, and the lands were forfeited to the Marquess of Argyll. In 1661 Argyll too was executed, and Mugdock was returned to the Grahams, who restored the castle over a two-year period, building a mansion within the old castle walls. In 1682 the Grahams bought
Buchanan Auld House near Drymen, a dwelling more fitting the title of "Marquess", though the family's official seat was kept at Mugdock Castle for a some time. A terraced walled garden, incorporating a summer house, was built to the east of the castle in the 1820s. Local historian John Guthrie Smith (1834–1894), a relative of the Smith family of nearby
Craigend Castle, leased the house from 1874. He had the 17th-century mansion demolished, and commissioned a
Scottish baronial style house to be built in the ruins of the old castle. It was designed by architects
Cambell Douglas & Sellars, and was extended to designs by James Sellars in the 1880s. During
World War II the house was requisitioned for use by the government. In 1945,
Hugh Fraser (later Lord Fraser), owner of the large retail chain now known as
House of Fraser, purchased Mugdock Castle from the Duke of Montrose. The 19th-century Mugdock House burned down in 1966, along with the remaining 16th-century outbuildings. The estate remains as
Mugdock Country Park, and the ruins are publicly accessible. The remaining tower of the 14th-century castle has been renovated as a museum. The castle is protected as a
scheduled monument. ==Architecture==