that one century of musicians voted with the seniors, the other with the juniors, and so of the mechanics,[1243] is erroneous; for the seniors did not vote separately from the juniors. In the centuriate assembly each of the six tribal troops of knights[1244] had one vote, and was called, therefore, a suffragium. As the term centuria had not previously applied to these groups, it was for a time withheld from them in the comitia, the six divisions being known simply as the sex suffragia.[1245] Afterward as new voting groups were added to the equites they came to be called centuries, and thence the term extended to the old.[1246] The centuriate organization of the comitia did not demand the creation of suffragia seniorum, to correspond with the centuriae seniorum of the infantry, perhaps because the six votes in the comitia centuriata adequately represented the whole number of patricians. As the equites originally provided their own horses,[1247] they held their rank for life, not merely through the period of service. After the state had undertaken to furnish money for the purchase and keeping of the horses,[1248] the eques retained his public horse, and consequently his membership in an equestrian century, long after his retirement from active duty.[1249] The increase in the number of equestrian votes was owing to the participation of plebeians in the mounted service.[1250] From them twelve equestrian centuries were formed for the centuriate assembly, and added to the six groups already existing. This increase probably came about in the course of the fourth century, accompanying or following the enlargement of the infantry from two to four legions.[1251] Thus the total number of one hundred and ninety-three centuries could not have been reached till shortly before 269. The foregoing discussion has made it evident that from the time when the comitia centuriata came into being, there were two centuriate organizations; (1) the military, which continued as before till it changed to the manipular formation,[1252] (2) the political, which developed from the military but which was at no time identical with it. DISCRIPTIO CENTURIARUM OF THE COMITIA CENTURIATA