Martène, Edmond; Durand, Ursine (1717). Thesaurus novus anecdotorum (in Latin). Paris: Sumptibus Florentini Delaulne. pp. 213–217.
In June 1296 he was serving as Rector of the Marches of Ancona and Romandiola, of the City of Bologna, and the County of Spoleto: Fantuzzi, Marco (1802). Monumenti ravennati de' secoli di mezzo per la maggior parte inediti (in Italian and Latin). Vol. Tomo III. Venezia. pp. 170–171.