↑ Butler, Alban (2000). Butler's Lives of the Saints. Continuum International Publishing Group. p. 93. ISBN0860122530. Unknown parameter |coauthors= ignored (|author= suggested) (help)
↑ Marjorie Chibnall (Select Documents of the English Lands of the Abbey of Bec, Camden (3rd Ser.) 73 (1951) pp. 25-26) followed earlier writers in suggesting that since the names Godfrey and Geoffrey shared a common origin, Godfrey is identical to the Geoffrey of Boulogne who appears in English records, marrying Beatrice, daughter of Geoffrey de Mandeville and that he left behind in England a son, William de Boulogne (adult by 1106, d. ca. 1169). The theory is discussed at length in the 8th ed. of Weis, Frederick, Ancestral Roots of Certain American Colonists Who Came to America before 1700: Lineages from Alfred the Great, Charlemagne, Malcolm of Scotland, Robert the Strong, and other Historical Individuals (Baltimore: Genealogical Publishing Co., Inc., 2006), pp. 152-154. However, Alan Murray analyzed the argument in detail and concluded that contemporary documents clearly distinguish between the two names, and as there is no evidence for their identity and traditions of the Crusade indicate Geoffrey was unmarried and childless, the two must be considered to have been distinct. Geoffrey, the English landholder, was apparently an illegitimate brother of Godfrey, the Crusader. Murray, Alan, The Crusader Kingdom of Jerusalem: A Dynastic History 1099-1125 (Unit for Prosopographical Research, Linacre College, Oxford, 2000) pp. 155-165.
