The contents of the LGE work can be divided into ten "books":

• The Settlement of Cessair
• The Settlement of Partholon
  The Settlement of Nemed
• The Settlements of the Fir Bolg, Fir Domnann and Fir Gálioin
  The Settlement of the Tuatha De Danann
• The Milesian Invasion   
• The Roll of the Kings of Ireland before the Introduction of Christianity
  
• The Roll of the Kings of Ireland after the Introduction of Christianity - A continuation of the previous book. This book is the most accurate part of LGE, since it is concerned with historical kings of Ireland whose deeds and dates are preserved in written records.