Humphrey de Bohun
Lady Margaret de Bohun was born on 3 April 1311 at Caldecote, Northamptonshire, the third daughter and seventh child of Humphrey de Bohun, 4th Earl of Hereford, Lord Constable of England by his wife Elizabeth of Rhuddlan, the youngest daughter of King Edward I and Eleanor of Castile. Her paternal grandparents were Humphrey de Bohun, 3rd Earl of Hereford and Maud de Fiennes. She was named after her maternal step-grandmother, Margaret of France, the second queen consort of Edward I.