This book is the result of about fourteen years (2009-2023) of papers, made for different symposia about the Eastern-Christian traditions: eight researches on the Georgian Bible and five on the Armenian. There were already papers published in the West: on the Codex Schoeyen and on Codex Scheide, a research on Gregory of Nazianze and an article on the Sanctus. But others remained unpublished, or they were hardly accessible in the West. Therefore we do publish them here to show their importance for the traditions of the Early Church. As the Appendix of Chapter 11 we publish a full edition of the Armenian column of the manuscript Barberinus Orientalis, which is compared with the text of the edition of Zohrab. We include here also three on Coptic and one on Ethiopic, that we add to our previous publications on the Armenian Gospel of Mark, on the Ethiopian Gospel of John, on the Gospel of John in Greek, and on the Coptic Codex Schoeyen. These were for a more specialized public, being as a kind of reference-works. The contributions we publish here, though having a rough, unfinished state of their text, aim at a more general audience: we hope they will be a bit more accessible.