Family: Sir Roger, 3rd Baron, de la Warre (maid. name Lord la Warr) / Lady Joan De Mowbray, Baroness Grey of Heaton

Maternal line Sir Roger, 3rd Baron, de la Warre (maid. name Lord la Warr)
Lady Margaretha de Holand, (maid. name Baroness de la Ware) Abt 1308 - 1349  (~ 41 years)	_	Sir John, 3rd Baron, de la Warre Abt 1300 - 1331  (~ 31 years)

Maternal line Lady Joan De Mowbray, Baroness Grey of Heaton
Duchess Elizabeth Segrave 1338 - 1398  (59 years)	_	John ( 4rh baron Mowbray of theisk) de Mowbray 1340 - 1368  (28 years)