[1] The Earl of Pembroke (previously Jasper Tudor, the uncle of Henry VII), owned St Catherine's Island until the reign of Elizabeth I.

Later, ownership passed to the Corporation of Tenby, which took possession of a number of crown lands.

The construction of St Catherine's Fort in 1867 necessitated the demolishing of the remains of the church.

[8] Formed from an outcrop of limestone, on average 25m high, the island is riddled with tidal caves.

[7] The area below the high waterline at St Catherine's Island is a Site of Special Scientific Interest.