Welsh title, Llyfr Aneirin. Transcribed in the middle of the 13th century and now kept in the South Glamorgan County Library; 80 per cent of the orthography is 13th-century, while 20 per cent dates from the 9th and 10th centuries. The manuscript includes the famous poem Gododdin with the superscription, ‘This is the Gododdin. Aneirin sang it.’ To be distinguished from Canu Aneirin [The Poetical Works of Aneirin]. See The Text of the Book of Aneirin, ed. J. Gwenogvryn Evans (Pwllheli, 1908). Llyfr Aneirin: Facsimile, ed. and intro. Daniel Huws (Cardiff and Aberystwyth, 1989); Edward Anwyl, The Book of Aneirin (London, 1910); Brynley F. Roberts, Early Welsh Poetry: Studies in the Book of Aneirin (Cardiff, 1988). See also ANEIRIN, the 6th-century bard.