There is a legend which says since Satan was once an angel he cannot be wholly excluded from Christian places of worship or graveyards, but is only allowed on the north side Men and boys were once employed to go up of churche towers and shout, making a lot of noise to drive him away. In time this system was found both troublesome and costly so stone heads with open mouths were used instead. Such heads are often found on church towers or old castles so they were evidently considered effective in keeping the devil at bay. Few people bury their dead on the north side of old graveyards.