Gayncote’s origins are obscure, but by the 1420s he was trading in cloth from the port of Dartmouth.
Few details of Gayncote’s commercial activities have come to light, beyond a dramatic incident in 1433, when he and his associate William Notefield* sent a ship called the Grace Dieu to Lisbon in the charge of a Portuguese factor, Alvaro Gonzales. Having sold his employers’ merchandise, Gonzales returned with a cargo of Portuguese goods. However, he also brought with him a sizable number of his friends, and when Gayncote and Notefield tried to take possession of their cargo in the port of Southampton, they were attacked, as they claimed, by a mob of around 100 foreign merchants and mariners, and were forced to appeal to the authorities for redress.
In 1434 Gayncote sued out letters of protection for John, Lord Clinton’s expedition to France, which he may have joined as a victualler.
Gayncote did not live long thereafter, and was dead by 1453, when his widow, Joan, and his putative younger son, Walter, who had settled at Barnstaple, gave a bond for £4 6s. 8d. to the prominent Dartmouth merchant Nicholas Stebbing*.
