Background
Through her father, she was a great-granddaughter of Henry III of England. Mary was born in 1320 or 1321.
Through her father, she was a great-granddaughter of Henry III of England. Mary was born in 1320 or 1321.
She was a sister of Henry of Grosmont, 1st Duke of Lancaster, Maud, Countess of Ulster, Joan, Baroness de Mowbray, and Eleanor, Countess of Arundel. Mary died at Alnwick, Northumberland, England on 1 September 1362, where she was also buried. Her husband Henry would marry a second time to Joan Orreby, daughter and heiress of John, 2nd Lord Orreby.