Truro St Mary

Since at least 1259, and probably before, there has been a Parish Church of St Mary located on this site.  

When Truro was chosen it was assumed that the Parish Church would be completely demolished to make way for the Cathedral. However, the architect John Loughborough Pearson, argued and eventually gained permission to keep at least part of the old Parish Church. He cleverly incorporated the South Aisle of the church into his design for the new Cathedral, so that symbolically and physically the Mother Church of the Diocese has a protective arm around one of her daughter churches.

Extract from Website of Truro Cathedral.  http://www.trurocathedral.org.uk