Dante began to take up the active duties of a citizen in 1293 when the people of Florence rose against the nobles and took all their political powers from them. The aristocratic party had henceforth to submit to the humiliation of enrolling themselves as members of some guild or art if they wished to have political rights in the Republic. The poet was not too proud to adopt this course, and was duly entered in the register of the art of doctors and apothecaries. It was not necessary that he should study medicine, the regulation being a mere form, probably to carry out the idea that every citizen possessing the franchise should have a trade of some kind. The prosperity of the Republic was not destroyed by this petty revolution. Churches were built and stones laid for the new walls of Florence. Relations with other states demanded the services of a gracious and tactful {24} embassy. Dante became an ambassador, and was successful in arranging the business of diplomacy and in promoting the welfare of his city. He was too much engaged in important affairs to pay attention to every miserable quarrel of the Florentines. The powerful Donati showed dangerous hostility now to the wealthy Cerchi, their near neighbours. Dante acted as a mediator when he could spare the time to hear complaints. He was probably more in sympathy with the popular cause which was espoused by the Cerchi than with the arrogance of his wife's family. The feud of the Donati and Cerchi was fostered by the irruption of a family from Pistoia, who had separated into two distinct branches--the Bianchi and the Neri (the Whites and the Blacks)--and drawn their swords upon each other. The Cerchi chose to believe that the Bianchi were in the right, and, of course, the Donati took up the cause of the Neri. The original dispute had long been forgotten, but any excuse would serve two factions anxious to fight. Brawling took place at a May _festa_, in which several persons were wounded. Dante was glad to divert his mind from all his discords when the last year of the thirteenth century came and he set out to Rome on pilgrimage. At Easter all the world seemed to be flocking to that solemn festival of the Catholic Church, where the erring could obtain indulgence by fifteen days of devotion. Yet the very break in the usual life of audiences and journeys must have been grateful to the tired ambassador. He began to muse on the poetic aims of his first youth and the work which was to make Beatrice's name immortal. Some lines of the new poem were written in the Latin tongue, then held the finest language for expressing a great subject. The poet had to abandon his scheme for {25} a time at least, when he was made one of the Priors, or supreme rulers, of Florence in June 1300.