Another diptych of Flavius Petrus, A.D. 516, has this inscription within a large circle: “I, the consul, offer these presents, though small in value, still ample in honours, to my [senatorial] fathers.” This is given by M. Pulszky, in his essay on antique ivories. The same writer quotes the often-cited decree of the emperor Theodosius; by which, because of the honour attached to the receiving of these diptychs, the presenting of them by anyone but the ordinary consuls was forbidden. The law ought not to be omitted here: “Lex XV. Codex Theodosianus, _tit._ xi. De expensis ludorum. Illud etiam constitutione solidamus, ut exceptis consulibus ordinariis, nulli prorsus alteri auream sportulam aut diptycha ex ebore dandi facultas sit. Cum publica celebrantur officia, sit sportulis nummus argenteus, alia materia diptycha.” During the period when these ivory diptychs were in use or fashion, that is (so far as we know) from the first or second centuries to the sixth, the office of consul was entirely in the hands of the emperors, who conferred it on whom they would, and assumed it themselves as often as they thought fit. Augustus was consul thirteen times; Vitellius proclaimed himself perpetual consul; Vespasian eight times; and Domitian seventeen. The consuls, therefore, gradually became mere ciphers in the state. It is true that they presided in the senate and on other public occasions with all the ancient forms; and the mere title, down to the extinction of the western empire, was nominally the most exalted and honourable of all official positions. The most complete list which we have of the existing consular diptychs is given by professor Westwood in a carefully written paper read before the Oxford architectural society, and printed in their proceedings for 1862. These are supposed to have been all identified, and, in most instances, by the inscription on the ivory. Nevertheless, we must still acknowledge to a grave doubt about more than one:—