Taliesin or Taliessin (both: tălēĕsˈĭn) [key], 6th cent.?, Welsh bard, whose Book of Taliesin is one of the great Welsh poetic works. The book exists only in a 13th-century form, but tradition places Taliesin in the 6th cent., as a contemporary of the battles his poems celebrate. One theory about Taliesin is that he was an ancient Celtic mythical character, about whose name have collected a series of traditional poems.
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