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Biography
William Borthwick, 4th Lord Borthwick (died 1542) was a Scottish nobleman.
He succeeded his father William Borthwick, 3rd Lord Borthwick in 1503. Immediately after the battle of Flodden, William, 4th Lord Borthwick, was appointed by the Privy Council of Scotland to the command of Stirling Castle which was ordered to be well fortified, along with the important custody of the infant monarch, King James V of Scotland.
The seal of William, Lord Borthwick, appears on the treaty signed with England on 7 October 1517.
Lord Borthwick married, in 1491, Margaret, eldest daughter of John Hay, 1st Lord Hay of Yester, by whom he had two sons and three daughters:
Thomas, Master of Borthwick (d. 1528). Died without issue.
John Borthwick, 5th Lord Borthwick (d. March 1566), a Privy Counsellor who opposed the Scottish Reformation.
Catherine, (eldest daughter), married Sir James Crichton of Frendraught, Knt.
Jonette, married in 1534/5, Sir Alexander Lauder of Haltoun, Knt., (killed at the battle of Pinkie).
Margaret, married Sir John Borthwick of Cineray (who died bef. December 1570).