Studies of William Blake's poetry have historically paid little attention to the Welsh literary context of his time, especially the bardic lore (barddas), in spite of the fact that he considered himselfto be a bard and created an epic cosmos in which the bardic had exalted status. Of particular importance is the Welsh concept of the awen, which can be thought of as "the muse," but which must not be limited to the Greek understanding of the term For the Welsh, the awen had to do with the Christian concept of the Holy Spirit, and beyond that, with the poet's connection with his inspiration, or genius, whether Christian of otherwise. This study explores the idea of inspiration as it evolves from the Greek idea of the Muse, as it was perceived in the Middle Ages by Welsh writers, and as it came to be understood and utilized by writers in the Age of Blake.