Background
He was the son and heir of William de Botreaux (d 22 July 1349) of Forrabury, Cornwall (renamed after his family Boscastle, anciently “Bottreaux Castle”, Cornish: Kastell Boterel) Sheriff of Cornwall, by Isabel de Moels, younger daughter and co-heiress (with her sister Muriel, the wife of Thomas Courtenay (d 1363) 5th son of Hugh de Courtenay, 1st Earl of Devon (1275–1340) of John de Moels, 4th Baron Moels(d1337), of East Berkhampstead, Hertfordshire and feudal baron of a moiety of North Cadbury, Somerset, by his wife Joan Lovel, daughter of Richard Lovel of Castle Cary, Somerset. The family is believed to have come from Les Bottereaux, in Upper Normandy near Evreux, France. His father William (d 1349) was the son of Reynold (d 1346), son of William (d c 1342), son of William (d 1302), son of Reynold (d 1273).