The paper offers new arguments for the more exact dating – autumn-winter of 963 – of the manuscript of the treatise De cerimoniis aulae byzantinae (Leipzig, Univ. Bibl. Rep. I 17). At the end of the list of the tombs of the emperors in the Mausoleum of Constantine the Great in the Church of the Holy Apostles, included in this compilation treatise, the scribe missed three empty lines. The last emperor in the list of buried emperors is Constantine VII Porphyrogenitus; there is no sarcophagus of his son Roman II, known from the later lists of tombs. The list ends with a mention of the “small sarcophagus” (τὸ λαρνάκιον); and there is no indication, whether there was someone buried there. Judging by the chronicles of Yahya of Antioch and Leo Dea...