Who is Taliesin from A String in the Harp and what is their importance?

Taliesin was a famous Welsh bard. His memories haunt the harp key that Peter finds in the water. Taliesin was known as a good, honest, and strong bard. He was exiled from his home when he was twelve-years-old to collect the king's war stories. He then spent the rest of his life carrying around the king's stories, as the Welsh do not have a written language. It was also Taliesin's job to find the next bard and pass on his stories.