Commentary Purg XIV 98

Pier Traversaro, the most distinguished member of the powerful Ghibelline family of Ravenna and renowned for his patronage of poets, was an ally of Guido del Duca.  At the end of his life in 1225 he was the unofficial ruler of Ravenna, where he had earlier been podestà for three separate terms, but his son Paolo, who succeeded him as the central political figure in the city, became a Guelph and, at his death in 1240, the Traversaro influence in Ravenna, which had been strong for nearly 300 years, came to its end.  Guido di Carpigna, a Guelph whose family was related to the counts of Montefeltro, was once podestà of Ravenna (in 1251).