Like a lot of British towns, there are 2 parish Churches in Launceston.
I went to the parish of St Thomas, walked along the river, saw the outside of the Church, and the remains of a Priory that was in use during The Doomsday Book of 1086.
I also saw Charles Causley's grave.
Birthplace of Charles Causley -
St Thomas Church
The oldest stone I saw - 1748
St Thomas Priory remains