Keteridge’s origins and parentage have not been established with any degree of certainty, but it is possible that his family hailed from Cambridgeshire or Hertfordshire, for a namesake, said to come from those counties, was associated in 1413 with the London grocer Richard Keteridge, a later connexion of the Plymouth man.
It was probably also in the course of his professional activities that Keteridge first came to the attention of the burgesses of Tavistock, whom he twice represented in the Commons. Evidently, they were content with his services, for some of their number subsequently called upon him in a private capacity. In 1430 and 1440 he appeared in the court of common pleas as attorney for Richard Secheville* in his disputes with John Julkin* and others, and in 1438 he acted as one of the arbiters in Secheville’s drawn out dispute with Henry Fortescue†, the former chief justice of Ireland.
Keteridge’s property at Sutton Prior (in Plymouth) was mostly acquired between 1427 and 1436 by a string of purchases from the hosier John Hereford and the Penzance burgess Alexander Kenegy, and included more than 30 messuages, four gardens and other lands. Another tenement, in Nethercombe in Holbeton, was leased from Richard Secheville and his wife Margery in 1438.
Little else is known of Keteridge’s career. By early 1437 he was in dispute with his neighbour Thomas Hill IV* over a trespass, the nature of which is now obscure,
