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|Type||Castle of Enceinte|
|Height||1-3m present day|
|Built by||Bonkyl, Stewart, Douglas|
|In use||11th–16th centuries|
Bonkyll Castle (also variously spelled Bonkyl, Boncle, Buncle, Bunkle or Bonkill) was a medieval fortress situated in the historic Scottish county of Berwickshire, from 1973 the Scottish Borders. It is situated 4 miles north of Duns and 4 miles south of Grantshouse. Few traces survive and the site is protected as a scheduled monument. It was the seat of a junior branch of the Stewart family, known as "Stewart of Bonkyl", from which was descended in another junior branch "Stewart of Darnley", the paternal family of King James I & VI of Scotland and England.
The seat of the powerful barony of Bonkyll, the castle originally belonged to the de Bonkyll family, which took its name. Their canting arms were three buckles. The last in the male line was Sir Alexander de Bonkyll, whose daughter and heiress Margaret de Bonkyl married Sir John Stewart (d.1298). The castle was slighted in the course of the First War of Independence. After the death of her father in 1300, Margaret reconciled with Edward I in 1304, who restored the lands of Bonkyll to her.
Stewart of Bonkyll
- Sir Alexander Stewart of Bonkyll (d.1319), the oldest son of Sir John Stewart (d.1298) and Margaret de Bonkyll, and the first "Stewart of Bonkyll," inherited the Bonkyll estate and title after the death of his mother.
- John Stewart, 1st Earl of Angus (d.1331), son, who in 1328 married Margaret de Abernethy, the heiress of the Lordship of Abernethy. In 1329 King Robert I of Scotland created him Earl of Angus. He thus controlled broad territories in Berwickshire, Angus, and Kinross-shire.
- Thomas Stewart, 2nd Earl of Angus (b.pre-1331-1361), son, who died without male issue, leaving a daughter and heiress Margaret Stewart.
Douglas, Earls of Angus
From the Countess Margaret's death in 1417 Bunkle passed to her son George Douglas, 1st Earl of Angus, with whose descendants it remained until the late 18th century.
George Douglas, Master of Angus, lord of the barony of Bonkill, made several charters while residing at the castle. The property passed to his widow Elizabeth Drummond as part of her jointure. Bunkle subsequently belonged to Margaret Tudor as Countess of Angus, and was held by George Douglas of Pittendreich, who had been Bailie of Bonkill since 1514. Her husband Archibald Douglas, 6th Earl of Angus was at Bonkill on 28 November 1522. In August 1523 the Earl of Surrey suggested that if Margaret Tudor came to Bunkle with her silver plate and jewels, pretending to intercede for the people of the Scottish borders, he could convey her safely to England.
The poet and laird Patrick Hume of Polwarth was bailie of Bonkyll in 1593 for James VI and he was instructed to use the rents from the houses in the mains of Bonkyll to pay the wages of the king's huntsman John Acheson.
Earls of Home
In the late 18th century ownership of Bunkle Castle passed to the Earls of Home.
A popular Berwickshire rhyme refers to the medieval strengths of Bonkyll and the nearby fortresses of Billie Castle, and Blanerne Castle referring to their construction in the time of David I and to their sad ultimate fates as piles of rubble, an allegory to the effective extinction of the Kingdom of Scotland after the formation of Great Britain in 1707:
Bunkle, Billie and Blanerne
Three castles strong as airn
Built when Davie was a bairn
They'll all gang doon,
Wi' Scotland's Croon
And ilka ane shall be a cairn
- Historic Environment Scotland. "Bunkle Castle (SM2407)". Retrieved 21 February 2019.
- Three buckles per: Johnston, G. Harvey, The Heraldry of the Stewarts, Edinburgh, 1906, p.47. Tinctures assumed to be: Gules, three buckles or, tinctures used in arms of their successors, Stewart of Bonkyll, also in the arms of Stuart of Darnley (a junior branch of Stewart of Bonkyll), Seigneurs d'Aubigny, and by the Ducs d'Aubigny, created by the King of France at the request of King Charles II of England (himself the senior representative of Stewart of Darnley, Earls of Lennox) for his mistress Louise de Kérouaille, Duchess of Portsmouth
- Johnston, G. Harvey, The Heraldry of the Stewarts, Edinburgh, 1906, p.47
- HMC Colonel David Milne Home of Wedderburn Castle (London, 1902), pp. 30-1, 185-6.
- J. S. Brewer, Letters and Papers Henry VIII, 2:1 (London, 1864), p. 206 no. 779.
- HMC Colonel David Milne Home of Wedderburn Castle (London, 1902), p. 33.
- J. S. Brewer, Letters and Papers Henry VIII, 3:2 (London, 1867), p. 1358 no. 3273.
- HMC 14th Report: Marchmont (London, 1894), p. 78