De expugnatione is untitled in its sole manuscript. Its first English editor, William Stubbs, gave it its modern title, which was picked up by Charles Wendell David, who preferred it for its similarity to the titles used by the Lisbon Academy, by Reinhold Pauli for his German edition of some excerpts, and in the bibliographies of August Potthast and Auguste Molinier. Charles Purton Cooper, in recognition of the text's form as an epistle, designates the it Cruce Signati anglici Epistola de expugnatione Ulisiponis ("English Crusaders' Letter on the Conquest of Lisbon").