Margaret, Duchess of Norfolk

Margaret of Norfolk (c. 1322–1399) was the daughter of Thomas of Brotherton, Earl of Norfolk. After her brother Edward died childless in 1334, she and her sister Alice became heirs; in 1338 Margaret succeeded to the earldom of Norfolk and the office of Earl Marshal.

In 1335 she married John de Segrave. She sought an annulment in 1350 and crossed the Channel in disguise against the king's prohibition. After Segrave's death in 1353 she married Walter Manny, and in 1397 Richard II created her Duchess of Norfolk.