and English that are themselves noteworthy. The collection includes: The Black Book of Carmarthen (c. 1250), the earliest manuscript in Welsh (Peniarth MS 1). The Book of Taliesin (c. 1350–1400) contains the oldest Welsh verse by the sixth-century poet Taliesin (Peniarth MS 2). The White Book of Rhydderch (c. 1350), a composite volume that contains the earliest version of the Mabinogion (Peniarth MS 4). The earliest fragments of Branwen and Manawydan and two fragments of Geraint ap Erbin comprise the four parts of Peniarth MS 6. Ystoryaeu Seint Greal (Tales of the Holy Grail), transcribed by Hywel Fychan around the year 1300, is the finest in a series of Romance manuscripts. A letter addressed to Lady Charlotte Guest concerning access to this text to have it copied is loose inside the volume (Peniarth MS 11). The Chronicle of the Princes in Peniarth MS 20 (c. 1330) is one of the two main versions of Brut y Tywysogion, the other being the Red Book of Hergest, which is in the Bodleian Library, Oxford. History of the Kings (Peniarth MS 23C), is a copy of Brut y Brenhinedd, the Welsh translation of the Historia Regum Britanniae by Geoffrey of Monmouth. It is a rare instance of an illustrated medieval Welsh manuscript. The Laws of Hywel Dda (c. 1300–1350), the earliest extant text (in Latin) of native Welsh law (Peniarth MS 28). More than 50% of the manuscripts known to contain the laws of Hywel Dda are in the collections of the National Library, with the majority being in the Peniarth Collection (see the list of Welsh Law manuscripts). Llyfr Du'r Waun (mid-13th century), also known as the Black Book of Chirk, the earliest Welsh text of the laws of Hywel Dda (Peniarth MS 29). Peniarth 32 is a 15th-century volume of the laws of Hywel Dda. The Peniarth 51 manuscript contains poetry, Welsh grammar, vocabularies, and historical triads that was written, mostly in the hand of Gwilym Tew, during the second half of the 15th century. Barddoniaeth Hywel Dafi (c. 1483–1500), a volume of poetry most by and possibly in the hand of Howel Davi. Other poets included in this volume are Bedo Brwynllys, Dafydd Llwyd, Llywelyn ap Morgan, Dafydd ap Gwilym and Ieuan ap Howel. The assumption that this manuscript was written by Howel Davi is challenged by evidence, such as slips of the pen that occur in poems of Davi's