A manuscript containing a copy of the Book of Aneirin (pp. 1-81); a copy of the version of the Triads in the Red Book of Hergest (pp. 83-106, 113-114); a copy of a charter giving Cyfeiliog to Strata Marcella (pp. 115-117) (see Llanstephan MS 156, p. 180); notes on the three divisions of the Druids (pp. 126-130); and various notes and extracts.