Thomas Morgan of Llantarnam (or Bassaleg, a branch of the Morgan of Tredegar) (1546–1606), of the Welsh Morgan of Monmouthshire, was a confidant and spy for Mary, Queen of Scots, and was involved in the Babington plot to kill Queen Elizabeth I of England. In his youth, Thomas, a staunch Catholic, worked as Secretary of the Archbishop of York until 1568, and then for Lord Shrewsbury who had Mary under his care at this time. Morgan's Catholic leanings soon brought him into the confidence of the Scottish queen and Mary enlisted Morgan as her secretary and go-between for the period extending between 1569 -1572 which coincided with a series of important conspiracies against Elizabeth. Morgan was imprisoned for 3 years in the Tower of London before exiling himself to France.