 Although he was nominally succeeded by their only son Edmund de Lacy (c.1227-1258) for titles and lands that included Baron of Pontefract, Baron of Halton, and Constable of Chester, Margaret at first controlled the estates in lieu of her son who was still in his minority and being brought up at the court of Henry III and Eleanor of Provence.In 1243, Margaret inherited the manor of Grantchester on the death of her mother Hawise.Edmund was allowed to succeed to his titles and estates at the age of 18.