↑St. Antoninus of Florence, Chronica, in Augustinus Theiner (editor), Caesaris S. R. E. Cardinalis Baronii, Od. Raynaldi et Jac. Laderchii Annales Ecclesiastici Tomus Vigesimus 1198-1228 (Barri-Ducis: Ludovicus Guerin 1870), under the year 1216, no. 17, p. 355.
↑Recent revisionist argumentation has suggested that he might not have been a Savelli. The argument is based on the undeniable fact that there is no contemporary document that calls him Cencio Savelli. However, surnames were not in common use in the 12th and 13th century. The first use of the name Savelli is in connection with the father of Honorius IV, Luca Savelli. See Renato Lefevre, "Un papa Savelli (Onorio III) che non fu Savelli," Strenna dei Romanisti 52 (1991) 283-290; and Gualtiero Sirtoli, "Onorio III: il permanere di un dubbio sulla sua appartenenza al lignaggio Savelli," Frate Francesco 71 (2005), 415-431. But there is no certain proof that Honorius III did not belong to the Savelli family.