This book traces the rich history of the O'Sullivan Beare family, beginning with Dunboy Castle and its pivotal role in the family's heritage. The narrative is rooted in a family tree originally compiled on July 20, 1996, by Brother Damian O'Sullivan and Mortimer O'Sullivan, offering a comprehensive record of the family’s origins and significant milestones.

Updated today by Micaela Hanlon, granddaughter of John (Murt) O'Sullivan, this edition expands on the family's journey through the centuries, documenting the lives of the families. This book preserves the O'Sullivan Beare heritage for future generations.