The book "Latin and Irish Biographies of St. Cyran. Translations of Christian Literature. Series V. Lives of Celtic Saints" is a historical source that explores the life and activities of St. Cyran, one of the prominent ascetics and founders of monastic monasticism in Ireland. The author offers readers the original texts of the saint's Latin and Irish biographies, as well as their translations, which allow a better understanding of the spiritual and historical significance of the figure of St. Kieran and early Christianity in Ireland. This book is part of a series of publications devoted to the lives of Celtic saints and is a valuable resource for those interested in the history of Christianity and the Celtic tradition.