Many years after the temple of the Twin Gods had been built in the Forum, an important addition was made to the ceremonial by which the state annually testified its gratitude for their protection. Quintus Fabius and Publius Decius were elected Censors at a momentous crisis. It had become absolutely necessary that the classification of the citizens should be revised. On that classification depended the distribution of political power. Party spirit ran high; and the republic seemed to be in danger of falling under the dominion either of a narrow oligarchy or of an ignorant and headstrong rabble. Under such circumstances, the most illustrious patrician and the most illustrious plebeian of the age were entrusted with the office of arbitrating between the angry factions; and they performed their arduous task to the satisfaction of all honest and reasonable men.

One of their reforms was the remodelling of the equestrian order; and, having effected this reform, they determined to give to their work a sanction derived from religion. In the chivalrous societies of modern times,—societies which have much more than may at first sight appear in common with with the equestrian order of Rome,—it has been usual to invoke the special protection of some Saint, and to observe his day with peculiar solemnity. Thus the Companions of the Garter wear the image of St. George depending from their collars, and meet, on great occasions, in St. George's Chapel. Thus, when Louis the Fourteenth instituted a new order of chivalry for the rewarding of military merit, he commended it to the favor of his own glorified ancestor and patron, and decreed that all the members of the fraternity should meet at the royal palace on the feast of St. Louis, should attend the king to chapel, should hear mass, and should subsequently hold their great annual assembly. There is a considerable resemblance between this rule of the order of St. Louis and the rule which Fabius and Decius made respecting the Roman knights. It was ordained that a grand muster and inspection of the equestrian body should be part of the ceremonial performed, on the anniversary of the battle of Regillus, in honor of Castor and Pollux, the two equestrian gods. All the knights, clad in purple and crowned with olive, were to meet at a temple of Mars in the suburbs. Thence they were to ride in state to the Forum, where the temple of the Twins stood. This pageant was, during several centuries, considered as one of the most splendid sights of Rome. In the time of Dionysius the cavalcade sometimes consisted of five thousand horsemen, all persons of fair repute and easy fortune.