tank had been inserted in a room on the opposite side of the courtyard as a baptistery, with rich wall paintings above it. The large room was indeed found to have a raised pulptum at one end, big enough for one person in turn to read, preach and preside from; but too low to have been surmounted by a throne, and too small to have contained an altar. Otherwise the large room had no decoration or distinctive features at all. In 269, soon after Dura fell to the Persian army, a body of clerics assembled a charge sheet against the bishop of Antioch, Paul of Samosata, in the form of an open letter. Amongst the accusations was that Paul, who had received the civil rank of ducenarius due to contacts in the imperial court, had improperly erected an enclosure, or secretum, for himself in the church of Antioch; that within this enclosure he had erected a throne from which he presided in worship; and that he had trained a female choir to sing hymns of his own devising. These practices were all condemned as innovations, improperly importing the symbols of his secular Roman magistracy into church ritual; while presumptuously and blasphemously asserting that the person of the bishop in eucharistic worship is seated in the place of Christ himself. Still in a hundred years, all bishops in the Mediterranean world had cathedrals, all sat on thrones within an enclosed sanctuary space, and all had established trained choirs to enhance eucharistic worship. The driving principle underlying this change was the acceptance by bishops, more or less willingly, of an imperial invitation to adopt and maintain the duties, dignity and insignia proper to a public magistrate. Characteristically a Roman magistrate presided from a raised throne in a large, richly decorated and aisled rectangular hall called a basilica; and now bishops would do the same. The earliest of these new basilican cathedrals of which substantial remains are still visible (and maybe amongst the very earliest to be built) is below the Cathedral of Aquileia on the northern tip of the Adriatic sea. Dated from a mosaic inscription between 313 and 319, the complex consisted of two parallel east–west aisled halls of similar size; with a third smaller north–south cross-hall connecting them, which has been interpreted as the presence hall of the episcopium or bishop's residence. The three halls create an open courtyard, in