Celestine Campbell

Daughter of Sir Duncan Campell and his 1st wife, Margaret (Marjorie) Stewart (daughter of Robert Stewart, Duke of Albany, governor of Scotland).

While the references for her father Duncan state she died young, there is also a claim that Walter Stewart of Lennox, Master of Fife, had most of his children by an 'unknown' daughter of Duncan Campbell (1st Lord of Campbell) and Marjorie Stewart.

Since Celestine is the only identified daughter of Duncan & Marjorie, she is currently attached as the mother of most (if not all!) of Walter Stewart's children.