DIACONICON  , in the

Greek Church, the name given to a chamber on the south side of the central apse, where the sacred utensils, vessels, &c., of the church were kept . In the reign of Justin II . (565-574), owing to a change in the liturgy, the diaconicon and protheses were located in apses at the east end of the aisles . Before that time there was only one apse . In the churches in central Syria of slightly earlier date, the diaconicon is rectangular, the side apses at Kalat-Seman having been added at a later date .