The Office repertory that survives from the Augustinian double monastery in Klosterneuburg includes numerous chants set to poetic texts which supplemented and decorated the items of the yearly liturgy. These later additions to the main body of ecclesiastical chant include the famous so-called "Klosterneuburg" Easter play, 1 rhymed Offices for such feasts as the Conception of Mary, Benedict, and Ursula and her 11,000 virgin martyrs, 2 some hymns, and several tropes. Most of these chants occur multiple times within the eight earliest Klosterneuburg Office manuscripts 3 owing to the survival of several volumes which contain a similar liturgy. 4 However, the poetic chant Quem non prevalent is found in only 1 The Visitatio has been well-researched. See, among other studies, Pfeiffer, "Klosterneuburger Osterfeier"; Young,