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It corresponds to the secretarium or diaconicum of old.
In large churches the diaconicum majus comprised several rooms: the salutatorium, for reception and audiences of the bishop; the thesaurarium, where sacred vessels and books were kept; and the diaconicum properly so called.
Prothesis and diaconicum are ordinarily on either side of the apse.
The diaconicum is distinct from the prothesis, a small room where the offerings of the people were received.
The Council of Laodicea (can, xxi) forbade the inferior orders of the clergy to enter the diaconicum or touch the sacred vessels, and a canon of the first Council of Toledo pronounces that deacons who have been subjected to public penance must in future remain with the subdeacons and thus be withdrawn from the handling of these vessels.
Possibly the Greek pastophorion, where the Holy Eucharist was reserved, was simply the diaconicum.