The following thesis on the Lebor Gabála Érenn (LGÉ) will be divided into four chapters. The first chapter contains a discussion on the LGÉ and thoughts on why it was preserved, along with a re-examination of previous scholarship. The second section discusses the cultural relevance of certain elements within the LGÉ as it may have existed for both pre-Christian and post-Christian Irish natives. The third chapter is a discussion about the Navajo history, culture and origin mythology. The final chapter contains a cross-cultural comparison of the Irish material, focusing primarily on the origin mythology as presented in the LGÉ but also comparing relevant themes in the Irish tradition, with the origin mythology of the Navajo Native Americans. The investigation on the LGÉ utilizes Dr. R.A.S. Macalister's edited and translated edition by the Irish Text Society. The comparison material on the Navajo is their origin myth as presented by Aileen O'Bryan. I am by training an anthropologist and have used a modification of methodology one would expect when observing a culture to examine the evidence at my disposal. I have utilized some theories made popular by Franz Boas and Claude Lévi-Strauss along with theories on mythology popularized by Joseph Campbell and G.S. Kirk. However most of these theories have been blended together with additional theories of my own. My conclusions are that it is possible to discern if they are pre-historic or medieval but that is more to do with the possible overlap in the belief system of both the pre-Christian, and the early-Christian society. It is also possible to see structures that appear to be human universals within the LGÉ. A third conclusion is that the comparison shows how stagnated and manufactured the LGÉ is as an origin mythology.