Sir John Arundell (1470–1512), uncle, second son of Sir John Arundell. He was Sheriff of Cornwall and Vice Admiral of the West to King Henry VII and to his son King Henry VIII. He married Jane Grenville (died 1552), a daughter of Sir Thomas Grenville (died 1513), KB, lord of the manors of Bideford in Devon and of Stowe in the parish of Kilkhampton in Cornwall, Sheriff of Cornwall in 1481 and in 1486. The Grenville seat of Stowe was situated about 4 miles north of the Arundell secondary seat of Efford/Stratton, Bude. During the Wars of the Roses in his youth Grenville had been a Lancastrian supporter and had taken part in the conspiracy against Richard III organised by the Duke of Buckingham. On the accession of King Henry VII (1485–1509) and the end of the wars, Grenville was appointed one of the Esquires of the Body to that king. Jane Grenville survived her husband and remarried to Sir John Chamond of Launcells, about 1 mile south-east of Stratton. In her will she requested to be buried in Stratton Church, between the bodies of her two husbands. One of Jane Grenville's sisters, Katherine Grenville, married into the Arundell family of Lanherne, namely to Sir John VII Arundell of Lanherne (1474–1545) Knight Banneret, "the most important man in the county", being Receiver-General of the Duchy of Cornwall.