Margaret was the younger half-sister of King Philippe IV of France. Her father was King Philippe III of France and his second wife Marie of Brabant. After a series of sea battles between English and French saillors, the French King, Philippe IV proposed a truce which included the marriage of his half-sister Blanche to King Edward I and the retaking of Gascony from the English. Edward agreed to this but when the time came Philippe changed the agreement and offerred Blanche's younger sister, Margaret instead. This deception on the part of the French King led to renewed war between the two countries. Eventually Edward agreed to marry Margaret and peace with France. In 1299 Margaret married King Edward I of England. They had two sons and a daughter. Thomas as born on June 1, 1300 in Brotherton in Yorkshire, and was given the title of Earl of Yorkshire on December 16, 1312. Edmund was born as Woodstock on August 5, 1301, and was given the title Earl of Kent by Edward II. Eleanor, was born May 6, 1306 but died in childhood.

 Margaret (of France) (b.1279? - d.1317)
    +Edward (I, King of England 1272-1307) (b.1239 - d.1307)
        = Thomas (Earl of Norfolk) ( - d.1338)
        = Edmund (Earl of Kent) ( - d.1330)
            +Wake, Margaret ( - d.1349)
                = Joan (of Kent) (b.1328? - d.1385)
                    +Edward (The Black Prince) (b.1330 - d.1376)
                        = Edward (of Angouleme) (b.1365 - d.1372?)
                        = Richard (II, King of England 1377-1399) (b.1367 - d.1400)