The Nuttall Encyclopedia
Grand-master of the order of St. John of Jerusalem, of French origin; served under the Emperor Sigismund against the Turks; went to Rhodes; became a knight of St. John, and was chosen grand-master; defended Rhodes against 100,000 Turks, and thus stayed the career of Mahomet II., who, after establishing himself in Constantinople, was threatening to overrun Europe (1423-1503).
Wood, James, ed. Entry for 'D'aubusson, Pierre'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/d/daubusson-pierre.html. Frederick Warne & Co Ltd. London. 1900.