English Cathedrals - Truro Cathedral - View over river to Cathedral. Part of Box 144 Boswell Collection - English Cathedrals. The Cathedral of the Blessed Virgin Mary, Truro is an Anglican cathedral located in the city of Truro, Cornwall, England, United Kingdom. It was built between 1880 and 1910 to a Gothic Revival design by John Loughborough Pearson on the site of the parish church of St Mary. It is one of only three cathedrals in the United Kingdom with three spires.