Photographed by John Thomas.

Twm Siôn Cati or Thomas Jones (c. 1530-1609) was a native of Borthyffynnon, near Tregaron. He was a poet, antiquarian and genealogist, who served as steward of the lordship of Caron. Twm Siôn Cati is best known, however, for his reputation as a highwayman or thief. A number of folk tales and myths grew around his activities, and he was dubbed, rightly or wrongly, the 'Welsh Robin Hood' who robbed from the rich and gave to the poor. This cave near Llandovery in the Tywi valley is reputed to have been his hideout.