Tiriel is a narrative poem by William Blake, written c.1789. Considered the first of his prophetic books, it is also the first poem in which Blake used free septenaries, which he would go on to use in much of his later verse. Tiriel was unpublished during Blake's lifetime and remained so until 1874, when it appeared in William Michael Rossetti's Poetical Works of William Blake. Although Blake did not engrave the poem, he did make twelve sepia drawings to accompany the rough and unfinished manuscript, although three of them are considered lost as they have not been traced since 1863.
