The origins of the Lanoy family are uncertain, but by the 1420s they had formed an attachment to the Lords Botreaux of Boscastle. Thomas himself and a kinsman, John Lanoy, were drawn into the circle of Sir Ralph Botreaux*, the last baron’s influential and sinister uncle, and became implicated in his failed attempt in 1426 to murder his nephew by black magic. In early 1433 the two Lanoys (along with Robert Skelton* of Altarnon and one Thomas Wokysbrigge) were indicted at the sessions of the peace of having hired the thugs who had murdered the incompetent necromancer John Neuport near Tintagel.
Lanoy maintained a formal association with Launceston priory for more than another decade, and was still in its service in 1445 when Bishop Lacy of Exeter ordered an inquiry into the disorderly communal life of the canons. Among the faults found was an excessive number of servants, three of them, including Lanoy, explicitly labelled ‘inutiles’, whose dismissal the bishop ordered.
Few other details of Lanoy’s career have come to light, although it was probably he rather than a namesake who in early 1451 was suing the wealthy Walter Reynell* for return of a box of muniments,
