At the age of thirty-five he was elected prior, or supreme magistrate of Florence, an honor from which he dates all his subsequent misfortunes. During his priorship, the citizens were divided into two factions called the Neri and Bianchi, as bitterly opposed to each other as both had been to the Ghibellines. In the absence of Dante on an embassy to Rome, a pretext was found by the Neri, his opponents, for exciting the populace against him. His dwelling was demolished, his property confiscated, himself and his friends condemned to perpetual exile, with the provision that, if taken, they should be burned alive. After a fruitless attempt, by himself and his party, to surprise Florence, he quitted his companions in disgust, and passed the remainder of his life in wandering from one court of Italy to another, eating the bitter bread of dependence, which was granted him often as an alms. The greater part of his poem was composed during this period; but it appears that till the end of his life he continued to retouch the work. The last and most generous patron of Dante was Guido di Polenta, lord of Ravenna, and father of Francesca da Rimini, whose fatal love forms one of the most beautiful episodes of this poem. Polenta treated him, not as a dependent but as an honored guest, and in a dispute with the Republic of Venice he employed the poet as his ambassador, to effect a reconciliation; but he was refused even an audience, and, returning disappointed and broken-hearted to Ravenna, he died soon after at the age of fifty-six, having been in exile nineteen years. His fellow-citizens, who had closed their hearts and their gates against him while living, now deeply bewailed his death; and, during the two succeeding centuries, embassy after embassy was vainly sent from Florence to recover his honored remains. Not long after his death, those who had exiled him and confiscated his property provided that his poem should be read and expounded to the people in a church. Boccaccio was appointed to this professorship. Before the end of the sixteenth century, the "Divine Comedy" had gone through sixty editions.