A Ghibelline, he was a partisan of the Hohenstaufen in Italy and served the Emperor Frederick II and Manfred of Sicily as vicar of Romagna, the March of Ancona, and the Duchy of Spoleto.
Between 1228 and 1243 he assumed the character of a podestà in several Provençal and north Italian cities, such as Arles, Avignon, Asti, and Parma.
With relations between Manfred and Pope Urban IV deteriorating, Doria was forced to put Spoleto to fire and the sword in 1259.
Five years later, in 1264, he led a small army of Saracens and Germans against Charles of Anjou, who contested Manfred's throne.
[2] His other Provençal poem was a tenso, Per aquest cors, del teu trip, with Felip de Valenza.