""The Liturgy and Ritual of the Celtic Church"" is a book written by Frederick Edward Warren in 1881. It provides a detailed examination of the liturgical practices and religious rituals of the Celtic Church, which flourished in Ireland, Scotland, and Wales from the 5th to the 12th centuries. The book explores the distinctive features of the Celtic Church's liturgy, including its use of vernacular languages, its emphasis on the natural world, and...