 He succeeded his father in 1604 to the Trelawne manor his father had bought from the crown in 1600.In 1628, Trelawny became involved in the dispute between Charles I and leading members of Parliament which eventually led to the English Civil War.The King was anxious to influence the election of MPs so as to secure a more pliable Parliament, and in Cornwall efforts on his behalf were being directed by one James Bagg, acting in concert with the Duke of Buckingham.