Many poems in the collection allude to Christian and Latin texts as well as native British tradition, and the book contains the earliest mention in any Western post-classical vernacular literature of the feats of Hercules and Alexander the Great.
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According to the Book of Taliesin, he fought alongside Gwydion at the Battle of the Trees, in which he assisted his uncle in enchanting the trees to rise up in battle against Arawn, king of Annwn.