Penfoun was probably the son of a Cornish gentleman with landholdings at Whalesborough, who between 1411 and 1432 frequently attended the Cornish shire elections and set his seal to the sheriffs’ election indentures.
By 1416 William appears to have formed an association with the influential Sir William Bodrugan*, for, as he later recalled, he was in the latter’s company at East Looe that summer when a messenger arrived to tell of the birth of John Colshull*.
Penfoun does not appear to have been a litigious man, and is only occasionally found embroiled in disputes in the King’s courts. In August 1427 he was among a group of Cornish gentry, which also included the lawyers Richard Respryn†, Robert Colyn alias Brune* and Stephen Trenewith†, accused of having deprived Alexander Champernowne of land near East Orchard Marry (in Week St. Mary); in the autumn of 1451 he appeared as a defendant in the court of the Exchequer; and five years later he and his putative son John were suing a group of peasants for ransacking their houses at Penfoun and ‘Plymmeswode’.
In Henry VI’s reign Penfoun is not known to have held office either locally or under the Crown, although he occasionally served on local juries.
