Sir William Borthwick, 3rd Lord Borthwick (died 20 May 1503) was a Scottish nobleman, ambassador, and Master of the King's Household in 1485. The son of

William Borthwick, 2nd Lord Borthwick William Borthwick, 2nd Lord Borthwick (died between 6 October 1483 and 7 February 1484) was a Scottish landowner and ambassador to England. He was a son of William Borthwick, 1st Lord Borthwick. Borthwick served as ambassador to England in 1459 ...

(died c. 1483), the 3rd Lord Borthwick was knighted before his father. As Sir William de Borthwick, Knt, he appeared as defender on behalf of his father in an action of debt on 4 July 1476, when judgement was given against him. They appeared again together in an action on 16 October 1479, and this time had a judgement in their favour. He was one of the guarantors of the treaty with England dated 20 September 1484, and a Conservator of other treaties on 26 March 1494, 30 September 1497, and 12 July 1499. William, Lord Borthwick, as superior of the lands of Nenthorn,

Berwickshire Berwickshire ( gd, Siorrachd Bhearaig) is a historic county, registration county and lieutenancy area in south-eastern Scotland, on the English border. Berwickshire County Council existed from 1890 until 1975, when the area became part of t ...

, granted a charter of them to his second son, Alexander Borthwick, upon the resignation of James Wilson, the previous feuar, on 27 June 1495. Nisbet, Alexander, ''A System of Heraldry'' &c., volume 2, 1722, facsimile edition, Edinburgh, 1984, ''Appendix'', p. 106 Lord Borthwick died on 20 May 1503, and he was succeeded by his son and heir, William Borthwick, 4th Lord Borthwick. His daughter, Agnes Brothwick, married

David Kennedy, 1st Earl of Cassilis David Kennedy, 3rd Lord Kennedy and 1st Earl of Cassilis (After 1463 – 9 September 1513) was a Scottish peer, the son of John Kennedy, 2nd Lord Kennedy. He was born about 1463, in Maybole, Ayrshire, Scotland. He was a Privy Councillor of King ...

. While his other daughter, Catherine Borthwick, married

William Cunningham, 4th Earl of Glencairn William Cunningham, 4th Earl of Glencairn, 5th Lord of Kilmaurs (c. 1480–1548) was a Scottish nobleman, soldier, and "notorious intriguer". Family He was the eldest son and heir of Cuthbert Cunningham, 3rd Earl of Glencairn, by his spouse, Lady ...

References

1503 deaths Lords of Parliament (pre-1707) Borthwick, William 3rd Lord Borthwick, William 3rd Lord Court of James IV of Scotland Year of birth unknown {{Lord-of-Parliament-stub