he succeeded his father in 1361, inheriting the manor of Randall and Allington Castle.
His first wife was Maud Morice; his second, a woman named Beatrice, who outlived him.
His main heir was his son, Reynold, from his first marriage.
In the early 1370s Cobham twice sailed to Ireland for military service with the King's lieutenant, William of Windsor.
He also joined Thomas, Earl of Warwick, for the 1372 naval expedition to relieve La Rochelle.