Liber de Rebus Memorabilibus
Written by Henry of Herford
Brewer (p. 283) describes the text:
A derivate account of Prester John, which borrowed from the tmdition of King David being killed in 1202 by the Tartars (the earliest surviving exemplar of which is in the Annates Pegavienses... Another source which the author calls 'Egkardus' (?) repeating the familiar story of Prester John and his family being killed and maimed by the Mongols before they emerged from Asia, as well as excerpts from Otto of Freising and the Prester John Letter: Augustus Potthast (ed.), Liber de Rebus Memorabilioribus sive Chronicon Henrici de Hervordia (Goningen, 1859), pp. 175-6. No translation known.