Was Dante beaten by the black Guelphs

The answer to your question is YES

While he was in Rome, the Black Guelphs destroyed much of the city, and established a new government. Dante received word that his assets had been seized and that he was considered an absconder, having left the city. Condemned to perpetual exile, Dante never returned to his beloved Florence. An outcast, Dante wandered Italy for several years, beginning to outline La Commedia, his great work.