The earliest surviving collection of the Welsh Triads is bound in the manuscript Peniarth 16, now at the National Library of Wales, which has been dated to the third quarter of the 13th century and contains 46 of the 96 triads collated by Rachel Bromwich. Other important manuscripts include Peniarth 45 (written about 1275), and the pair White Book of Rhydderch (Welsh: Llyfr Gwyn Rhydderch) and Red Book of Hergest (Welsh: Llyfr Coch Hergest), which share a common version clearly different from the version behind the collections in the Peniarth manuscripts.
