- Born on May 3, 1717
- Deceased on December 17, 1778, at the age of 61 years
Parents
- James Steuart (1681 - 1727), Baronet Steuart of Goodtrees, Member of Parliament for Edinburgh, solicitor general for Scotland
- Ann Dalrymple (1695 - aft. 1723)
Family
- Married on January 31, 1739, with Henry Erskine (1710 - 1767), Earl of Buchan, grand Master of the Grand Lodge of Scotland, issuing