The
Book of Taliesin is a small manuscript, missing its covers, and thus the
beginning of the first poem; luckily, this poem is also contained in the Red
Book of Hergest. It contains 56 mostly-complete poems, and a fifty-seventh poem,
of which only remains the words: "Darogan Kat"--thought to be "Darogan
Katwaladr."
The majority of the translations I am using here are from The Four Ancient Books of Wales, by W. F. Skene, 1858. Unfortunately, they are probably not the most accurate translations, but they are the only ones which, to my knowledge, are public domain. (Even at that I'm not sure, though the book is well out of print.)