""A Discourse On The Religion Anciently Professed By The Irish And British"" is a historical and theological book written by James Usher in 1815. The book explores the religious practices and beliefs of the ancient Irish and British people, with a focus on the pre-Christian era. Usher delves into the mythology and folklore of these cultures, analyzing their gods and goddesses, rituals, and sacred sites. He also examines the impact of Christianity...