The main source of mythology comes from The Book of Invasions, or Lebor Gabala Erenn. It is an abridged compilation of both prose and poetry on the origins of Ireland and the extraordinary deities. The original was more expansive, but perished in what is to be assumed Viking raids or being claimed during war time. A supplemental text is attributed to a chronicler that goes by the name Keating who published his book in the 17th century. He had access to materials that have yet been published. Nennius and Eochaid Ua Flainn, chroniclers who lived during the 10th century, recorded mythological Irish history by way of poetry. Though, their contributions are short and semi-vague, they contain a lot of precious information on Ireland's spiritual beliefs of the time. The Tuatha De Danann can be linked to the same origins as the Gods in Greek mythology. Hesiod calls the Greek Gods "the Golden Race," and similar attributes are seen in the Celtic Gods.