^Salvador Miranda. "Cardinals of the 13th Century". The Cardinals of the Holy Roman Church. Archived from the original on 15 April 2019. Retrieved 10 February 2019.
Sources
Miranda, Salvador. "Consistories for the creation of Cardinals 13th Century (1198-1303): Gregory IX (1227-1241)". The Cardinals of the Holy Roman Church. Florida International University. OCLC 53276621.