This document is a summary of the contents of the book "The Wanderings of Oisin" by William Butler Yeats. It contains 3 chapters:
Book I introduces Oisin and St. Patrick, with Oisin recalling his time with the goddess Niamh and the Tuatha De Danann people. Book II and Book III continue Oisin's recollections and wanderings with Niamh in the lands of eternal youth. The summary provides context and sets up the story that will be told across the 3 chapters of the book.