Cronicl o Wech Oesoedd
NLW MS 5276D

The massive Welsh history written by Elis Gruffydd in Calais, ca. 1550. Most of the work has not been translated, but it is notable for providing the earliest version of "Ystoria Taliesin" and versions of the story of Maelgwn's wife and the ring (found in one of the saints' lives) and what looks like a retelling of the Vita Merlini.

The contents following are from Dyfed Lloyd Evans' site on the subject.

Ystoria Ercwlf	The History of Hercules
Ystori'r Llong Foel	History of the Bald Ship
Deuddeg Pwnc y Ffydd	The Twelve Matters of Belief
Chwedl Huail ap Kaw ac Arthur	The Tale of Huail and Arthur
Chwedl Myrddin a'r Marwolaeth Driphlyg	The Tale of Myrddin and the Three-fold Death
Marwolaeth Myrddin	The Death of Myrddin
Ystoria Taliesin	The History of Taliesin
Gwraig Maelgwn a'r Fodrwy	Maelgwn's Wife and the Ring
Myrddin a Phum Braeddwydd Gwenddydd	Myrddin and the Five Dreams of Gwenddydd