Jonathan Toup was a prominent Vicar of St Merryn, 1776–1785. A small marble tablet erected to his memory by his niece Phillis Blake is on the south wall of the church. The tablet, which states that Toup's scholarship was "known to the learned throughout Europe," had funding from the delegates of the Oxford University Press. When the Diocese of Truro was formed from the Archdeaconry of Cornwall in the Diocese of Exeter on 15 December 1876 St Merryn Church was included in the new diocese.