A castle is first recorded on the rocky peninsula at Dunbeath in 1428, when the lands belonged to the
Earl of Caithness. The first recorded
laird was Alexander Sutherland. In March 1650, Dunbeath was attacked by the Royalist forces of
James Graham, 1st Marquess of Montrose, during the
Wars of the Three Kingdoms. Sir John Sinclair rode to Edinburgh to warn of Montrose's arrival, leaving his wife Catherine Fraser to defend Dunbeath against
Sir John Hurry. She soon surrendered, and a Royalist garrison was installed. Montrose was defeated in April at the
Battle of Carbisdale, and the opposition forces, under
David Leslie, recaptured the castle. From 1894 to 1945, the castle was owned by Vice-Admiral Sir Edwyn Alexander-Sinclair. castle remained a private home; only the gardens were open to the public, by appointment. The Castle and grounds were sold in 2024 for £25,000,000.00. The new owner of Dunbeath Castle is a company called Dunbeath Estates Limited, whose sole director is Don Macleod. The identity of the buyer was hidden through a legal loophole involving trusts and company filings. ==The castle==