This appears to be a pedagogical text. It circulated anonymously for a long time, but a case has been put forward for the author as Pierre de la Palu (a .k.a. Petrus de Palude or Peter Paludanus). The date given here is based on de la Palu's date of death, and is therefore tentative. In any case, the section on Prester John is largely based on Jacques de Vitry's Letter VII... Edited in Ignazio Giorgi (ed.), in the Archives de "Orient Lalin. vol. I (Paris, 188 1), pp. 302- 3. For the attribution to Pierre de la Palu, see J.F. Benton, 'Theocratic History in Fourteenth-Century France: The Liber Bellorum Domini by Pierre de la Palu." University 0f Pennsylvania Library Chronicles, vol. 40 (Philadelphia, 1974), p. 43 If. No translation is known.