The Wandering of Oisin is a poem written by William Butler Yeats, an Irish poet, dramatist, and one of the foremost figures of 20th-century literature. The poem is part of a larger work, The Wanderings of Oisin and Other Poems, which was published in 1889. It tells the story of Oisin, a legendary Irish hero, and his travels to the Land of Youth. YMA is an acronym for Yeats' Muses and Angels, a group of female muses who inspired Yeats' work.