Margaret, Duchess of Norfolk (b.c. 1320)
Margaret of Norfolk or Margaret of Brotherton, in her own right Countess of Norfolk (sometimes surnamed as "Margaret Marshal"; c. 1322–24 March 1399), was the daughter and eventual sole heir of Thomas of Brotherton, eldest son of King Edward I of England by his second marriage. In 1338, she succeeded to the earldom of Norfolk and the office of Earl Marshal.