This document provides an overview of Celtic mythology, dividing it into Gaulish, Irish, and Scottish mythology. It summarizes some of the key gods, figures and stories in each tradition, such as the Tuatha Dé Danann in Irish mythology and kelpies and blue men in Scottish folklore. The document also outlines the major cycles of Irish mythology including the Mythological, Ulster, Fenian and Historical Cycles and notes some of the major figures and texts associated with each.