[1][2] The name of the islands derives from their traditional identification as the site of a hermitage used by Saint Tudwal during the 6th century.
The islands are part of the Llŷn Area of Outstanding Natural Beauty and are known for their beaches and wildlife, having a variety of wild birds including razorbills, guillemots and choughs, and being a breeding site for grey seals.
The western island houses the St Tudwal’s Lighthouse,[3] and the eastern has the remains of a priory.
More recently it was purchased by the adventurer Bear Grylls who holidays on the island, living in the former lighthouse keeper's cottage.
[3] On 22 August 2013 it was reported that he was facing a planning investigation by Gwynedd Council, after installing a slide into the sea.