By the late eighteenth century South Ronaldsay was divided into two unequally sized parishes, St. Peter’s covered the northern two thirds of the island while St. Mary’s formed the southern third. St. Peter’s church has a date stone of 1642 and appears on Blaeu's 1654 map. By 1793 the building had no roof and was "exposed to all the winds of heaven" but as probably repaired by 1801. A Pictish symbol stone was discovered in a window in the church. On one face of the slab is a mirror-case underlying part of an undecorated crescent and V-rod and on the other a crescent and V-rod, ornamented with scrollwork, below a decorated panel.