The former Archbishop of Canterbury Dr Rowan Williams is to become a volunteer at a church in Cornwall.
Now the Master of Magdalene College Cambridge, he was invited to take up the role at St Endellion Church in North Cornwall by the Bishop of Truro.
Last year Baron Williams nominated the church as his favourite in the UK.
The new Archbishop of Canterbury has been in Norwich today at the start of a special pilgrimage ahead of his official enthronement.
The Most Reverend Justin Welby led prayers at the Forum and the cathedral.
The Archbishop of Canterbury has arrived in Norwich as he starts his pilgrimage around five English cities.
The Most Rev Justin Welby has begun his "journey in prayer" in East Anglia, followed by visits to Coventry, London, Truro and Chichester over coming days.
The pilgrimage will involve a short period of prayer and then a walk to a cathedral where a prayer vigil will take place. Everyone is welcome to join the journey at "any point" a statement posted on the Archbishop of Canterbury's website said.
The new Archbishop of Canterbury is visiting Norwich today.
The Most Reverend Justin Welby will lead prayers at the Forum in the city this morning before making his way to Norwich Cathedral along with children from local Church of England Schools.