OSM tag name=St Martin matches St Martin's Church in these Wikidata fields:
| Church of England church buildings in Cornwall | man_made=tower, amenity=place_of_worship, building=church, denomination=anglican, disused:amenity=place_of_worship |
| Grade I listed churches in Cornwall | amenity=place_of_worship, disused:amenity=place_of_worship, man_made=tower, building=church |