In February 1250, Filippo was elected
bishop of Florence, although he appears to have remained in Ferrara. He was soon after elected to the
archdiocese of Ravenna on the initiative of the pope. He appears to have been elected by 5 April 1250, although a papal document of 20 April still refers to him only as bishop of Ferrara. The opposition of the counts of
Bagnacavallo prevented his travelling to Ravenna, and so he continued managing three dioceses from Ferrara. Another Pistoian,
Giovanni de' Mangiadori, was elected to Florence in his stead in 1251. On 12 March 1251, Filippo received a delegation of Ravennate exiles encouraging him to come to Ravenna with Bolognese assistance. He renewed the
emphyteusis of archdiocesan lands belonging to Azzo VII, but the latter was not forthcoming with assistance. He sent a missive to Ravenna from Ferrara on 24 September and another five days later from Argenta demanding the city's submission to him and the Holy See. Receiving no response, he excommunicated the magistrates and placed the city under
interdict. On 5 December, Innocent IV charged him with re-establishing peace in the archdiocese by military means and, on 25 January 1252, confirmed the interdict. An indication of the difficulty of managing more than one diocese as bishop-elect is found in the dispute between Filippo and his Ferrarese
chapter in March 1252. The latter refused to recognized an act of Filippo's which had inadvertently been sealed with the seal of Ravenna rather than that of Ferrara. On 17 August 1252, a new bishop was elected for Ferrara and Filippo ceased to administer it. On 3 April 1252, Filippo's appointment as legate in
Lombardy was postponed so that the legate
Ottaviano degli Ubaldini could finish his work. He would not take up the office for another three years, but in the interim he entered Ravenna on 1 March 1253. He even served a term as
podestà in 1254, combining secular and ecclesiastical offices. He promulgated statutes dealing with the office of
podestà, fines and policing. The archbishop was also responsible for the upkeep of the
Porta San Mama. On 28 April 1254, he held a
provincial synod. Innocent IV continued to trust important tasks to Filippo. By July 1254, he had appointed him mediator in the dispute between the
Republic of Venice and the rector of Cervia, Tommaso da Fogliano, over the Cervia salt pans. On 4 September, Innocent named him mediator in the dispute between the
diocese of Forlimpopoli and the counts of
Castrocaro. Between November 1254 and December 1255, Filippo was in
Apulia trying to foster an alliance against King
Manfred of Sicily, whose right to the crown the pope disputed. In early December, he returned to Ravenna. ==Legate in Lombardy==