John Trelawny (or Trelawney) (c. 1504 â 29 September 1563) was a Cornish Member of Parliament. The son of Walter and Isabella Trelawny of Poole-in-Menheniot, Cornwall, he was High Sheriff of Cornwall in 1547 and 1560. He represented Liskeard in the first Parliament of 1553 and Cornwall from 1559 until his death. He married twice; his son by his marriage to Margery Lamelion, John, was his heir and also served as High Sheriff.