|Walter, third High Stewart, was the first to adopt the name of his office as a surname. He was appointed Justiciar of Scotland by Alexander II. in 1230, and negotiated that king's second marriage. He is said by Duncan Stewart to have married Beatrix, daughter of Gilchrist, Earl of Angus, but no proof has been found of this, and he died in 1241, leaving issue:-
- 1. Alexander, his successor.
- 2. John, killed at Damietta 1249.
- 3. Walter, married Mary, younger daughter of Maurice, Earl of Menteith, and became Earl of Menteith (see that title). He appears to have died soon after 13 June 1292, leaving two sons:-
- (1) Alexander, his successor in the earldom, whose representation ultimately merged in the Ducal House of Albany by the marriage of his great-granddaughter to Robert Stewart, Duke of Albany.
- (2) Sir John, who was ancestor of the Menteiths of Rusky and Kerse.
- 4. Euphemia, married Patrick, sixth Earl of Dunbar.
- 5. Margaret, who is said to have been married to Nigel or Neil of Galloway, Earl of Carrick.
- 6. Elizabeth, or according to others, Beatrix, stated to have been married to Maldouen, Earl of Lennox.
- 7. Sir Robert Stewart of Tarbolton and Cruxton is said to have been a son of this Stewart.
- So also is William de Ruthven, ancestor of the Ruthvens, but this is founded on a mistaken reading of the Scone charter referred to above.