The second John Trelawny to sit in Parliament seems to have been the most prominent of the trio bearing this name, being the only one to represent his county. (It is possible, however, that the shire knight of 1413 was the eldest John, who had sat for Bodmin in 1397.) Whether it was he or his father who attended the shire elections of 1411 (when Richard Trelawny was returned for Launceston), 1414 (Nov.) and 1416 (Mar.), and was present at Launceston in November 1414 to witness a grant by the local authorities for the foundation of St. John’s chapel,
Trelawny’s return home in the King’s train enabled him to attend both Parliaments of 1421 as a knight of the shire, while John Trelawny III (probably his younger brother) sat in the second of these for Liskeard. The latter acted on his relation’s behalf in 1422 at the assizes when he was accused with Roger Menwenick and other of their kinsmen of disseising the prior of Launceston of common of the pasture at Trelaske. It would appear that by then Sir John had inherited the family estates. He exercised the right of patronage at Menheniot, a family living, in 1426. Trelawny was still receiving his royal annuity in 1432, and is last recorded in the following year completing a transaction concerning his manor of Trewinnick and other properties in Cornwall which, in default of heirs, were to pass to Thomas Courtenay, earl of Devon. He died before 1447, when Richard Trelawny, his presumed brother, presented to the church at Menheniot.
