Lord Borthwick inherited a tenement on the south side of Edinburgh's High Street divided into several "lands", and one land was occupied by the merchant James Hommyll.
[1] The four African people known as the "More lasses" stayed with Hommyll in November 1504.
[2] After the battle of Flodden in 1513 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.
This biography of a Lord of Parliament in the Peerage of Scotland is a stub.