The Trenewiths were an important Cornish family, closely related to the Bodrugans; and although Stephen himself seems to have come from a younger branch, he could rely on the support of his ‘myghty kynred’ when he needed it.
In 1381, when a young man, Trenewith gave evidence at a maritime court held at Padstow to investigate the seizure of a ship at Plymouth. Ten years later John Hawley I of Dartmouth, who had purchased the forfeited estates of the former chief justice, Sir Robert Tresilian, complained that Trenewith had unlawfully entered property worth £2 a year in ‘Little Trenewith’ near Padstow.
