This work explores an aspect of Yeats's writing largely ignored until now: namely, his wide-ranging absorption in S.T. Coleridge. Gibson explores the consistent and densely woven allusions to Coleridge in Yeats's prose and poetry, often in conjunction with other Romantic figures, arguing that the earlier poet provided him with both a model of philosopher - 'the sage' - and an interpretation of metaphysical ideas which were to have a resounding effect on his later poetry, and upon his rewriting of A Vision.