Recently we reported about the discovery of a fourth-sixth century monastery which has been partially (and badly) excavated 'in the hills near Jerusalem' (here). An interesting mosiac was unearthed: "O Lord God of Saint Theodorus, protect Antonius and Theodosia the illustres, Theophylactus and John the priest."
Now Theophylactus is named as a scribe of Codex Sinaiticus (ff. 42, 160b, 199b), and Antoninus is named within Codex Sinaiticus as providing the source text for some parts of the Greek Bible (see the notes from the Pamphilian corrector in 2 Esdras and Esther - in the Codex Friderico-Augustanus). This can hardly be coincidence, since both names are extraordinarily rare in the patristic period. It follows that Codex Sinaiticus must have been produced in this monastery.
The excavators of this monastery have also found some documents, one of which seems to be the copy of a loan arrangement which states that the monks of St Catherine's monastery have borrowed some manuscripts which they promise to return safely.