Even that Miguel Lorenzo Arranz(Μιχαὴλ Ἀρρανθ) was my Master's director and he was helping me with my liturgical education at Pontifical Oriental Institute[also Ἰωάννης Μ. Φουντούλης- Robert Taft- Stefano Parenti], I have to inform the community that the so called Euchologion Bessarion and its dating 1020 it is not accurate. The research of scholars have demonstrated that the manuscript is from Thirteenth Century and has no relation with Bessarion.
Especially on the manuscript and its dating see S. PARENTI– E. VELKOVSKA, «A Thirteenth Century Manuscript of the Constantinopolitan Euchology: Grottaferrata Γ.β. I, Alias of Cardinal Bessarion», στὸ BBGG terza serie 4 (2007), 175-196[Bolletino della Badia Greca di Grottaferrata]
About the manuscripts of the Constantinople and their characteristics I refer to the article of a disciple of M. ARRANZ and a good friend of mine, Π. ΚΑΛΑΙΤΖΙΔΟΥ, «Τρία χφφ «Πατριαρχικὰ» Εὐχολόγια: Paris, Coislin 213, Grottaferrata Γ. Β. I, Ἐθνικῆς Βιβλιοθήκης τῆς Ἑλλάδος 662. Ἱστορικοκριτικὴ προσέγγιση» στὸ Π. ΣΚΑΛΤΣΗ-ΝΙΚΟΔΗΜΟΥ ΣΚΡΕΤΤΑ (Ἀρχιμ.)(ἐπιμ.), Γηθόσυνον Σέβασμα. Ἀντίδωρον τιμῆς καὶ μνήμης εἰς τὸν μακαριστὸν καθηγητὴν τῆς Λειτουργικῆς Ἰωάννην Μ. Φουντούλην († 2007), Τόμος Α’, ἐκδ. «Ἀδελφῶν Κυριακίδη α.ε.», Θεσσαλονίκη 2013, 827-994. [He wrote a dissertation on Π. ΚΑΛΑΙΤΖΙΔΟΥ, L΄Eucologio manoscritto 662 della Biblioteca Nazionale di Grecia [Ἀνέκδοτη διατριβὴ ἐπὶ διδακτορίᾳ στὸ Τμῆμα τῶν Ἀνατολικῶν Ἐκκλησιαστικῶν Ἐπιστημῶν (Scienze Ecclesiastiche Orientali)τοῦ Pontificio Istituto Orientale], Roma 2003• ΤΟΥ ΙΔΙΟΥ, Τὸ ὑπ’ἀριθμ. 662 χειρόγραφο-εὐχολόγιο τῆς Ἐθνικῆς Βιβλιοθήκης τῆς Ἑλλάδος ( Excerpta ex Dissertatione ad Doctoratum PIO), Roma 2004.][He is preparing the publication]
About the manuscript tradition of Euschologion, its typology and a compare among the older manuscripts see Christos KANAVAS, L΄Eucologio MG 53 (sec. IX) del Monastero di S. Caterina del Sinai [Χρῆστος Ἀθ. Κανάβας, Τὸ ὑπ. ἀριθμ. ΜΓ 53(Θ'αἰ.) Εὐχολόγιον τῶν Νέων Εὑρυμάτων τῆς Ἱερᾶς Μονῆς τῆς Ἁγίας Αἰκατερίνης τοῦ Σινᾶ][It, with God’s benediction and the permision of the Monastery Ἱερᾶς Μονῆς τῆς Ἁγίας Αἰκατερίνης τοῦ Σινᾶ, will be published until December 2014].