High Quality Content by WIKIPEDIA articles! Céli Dé or Culdees were originally members of ascetic Christian monastic and eremitical communities of Ireland, Scotland and England in the Middle Ages. The term is used of St. John the Apostle, of a missioner from abroad recorded in the Annals of the Four Masters at the year 806, and of Óengus Céile Dé, the well-known monk and author of Tallaght. Culdee is an anglicisation of Céli Dé (plural of Céile Dé, lit. client/companion of God). Boeces term is culdei. In Scottish Latin sources they are often called Kelidei.