Sir Robert Hepburn of Alderston

SIR ROBERT HEPBURN OF ALDERSTON

Daryll Lundy's Peerage

https://www.st-andrews.ac.uk/history/ssne/item.php?id=1184
He (Sir Frederick Hamilton, Kt.) was twice married - first to Sidney, daughter of Sir John Vaughan, and then to Agnes, daughter of Sir Robert Hepburn - and he became the father of the barons Hamilton of Stackallan and the Viscount Boyne.

https://www.dib.ie/biography/hamilton-sir-frederick-a3737
He had married, firstly, Sidney, daughter of Sir John Vaughan (qv), the governor of Derry. They had a daughter, Christina, and three sons, all of whom became soldiers. James and Frederick both fought in their father's regiment in 1645–6, while Frederick died in 1647 in the Irish wars, in Connacht. The youngest son, Gustavus Hamilton (qv), later 1st Viscount Boyne, achieved fame in the Irish campaigns of King William (qv). A second marriage, to Agnes, or Alice, daughter of Sir Robert Hepburn of Alderstown, in Scotland, produced no children.

The Scots Peerage "Hamilton, Earl of Abercorn" page 45
"Sir Frederick [Hamilton] married, secondly, Agnes, who married secondly, before 29 March 1661, John Maxwell.