Dumbarton Oaks codex 3, 1 the former Mount Athos, Pantokrator codex 49, she noted the absence from the manuscript of seven leaves. Two of these she could describe since they had been ac-quired by the Benaki Museum in Athens2 and by the Cleveland Museum of Art. 3 Four of the re-maining five, though missing, were known through photographs at the Ecole des Hautes Etudes and Dumbarton Oaks4 or through reproductions or descriptions by earlier commentators on the manuscript. 5 But the remaining leaf, predicated by Der Nersessian on the basis of a lacuna in the text as folio 187 bis, remained unaccounted for until a de-tached page in the Tretjakov Gallery was asso-ciated with our Psalter and New Testament. 6

In fact, this page had been known long before VG Putsko identified it with our book, the Easter tables of which provide for the years 1084-1101. It came to the Gallery in Moscow on 9 December 1930 from the Zagorsk Museum where it was kept after its presentation in 1919 to the Trinity-Sergius