In the earliest period of the diocese, the episcopal see was often referred to as Tír Conaill (the surrounding region). It was also sometimes written as Ráith Both, the Middle Irish spelling of the location. In 1266, Bishop Germanus of Derry forcibly transferred the Inishowen peninsula from the jurisdiction of the Diocese of Raphoe to the Diocese of Derry.
^"Bishop Alexander Aloysius (Alan) McGuckian [Catholic-Hierarchy]". catholic-hierarchy.org.
References
Cotton, Henry (1849). The Province of Ulster. Fasti Ecclesiae Hiberniae: The Succession of the Prelates and Members of the Cathedral Bodies of Ireland. Vol. 3. Dublin: Hodges and Smith.
Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I., eds. (1986). Handbook of British Chronology (3rd, reprinted 2003 ed.). Cambridge: Cambridge University Press. ISBN 0-521-56350-X.
Moody, T. W.; Martin, F. X.; Byrne, F. J., eds. (1984). Maps, Genealogies, Lists: A Companion to Irish History, Part II. A New History of Ireland. Vol. IX. Oxford: Oxford University Press. ISBN 0-19-821745-5.