Question: Who is the mother of Margaret Mortimer, Baroness Berkeley?
Sentence (from "Roger Mortimer, 1st Earl of March"): Roger Mortimer, 3rd Baron Mortimer, 1st Earl of March (25 April 128729 November 1330), was an English nobleman and powerful Marcher lord who gained many estates in the Welsh Marches and Ireland following his advantageous marriage to the wealthy heiress Joan de Geneville, 2nd Baroness Geneville.
Relevant evidence: Yes