Headings: Sixtus IV, Pont. Max. (formerly Franciscus, Cardinalis de Rovere) Bullae duae in commodum ordinis minorum: Sixtus IV, Bulla 31 Aug. 1474 "Regimini universalis" (Including: Eugenius IV, Bulla 10 Nov. 1439 "Licet debitum"; Clemens IV, Bulla 21 July 1265 "Virtute conspicous"), Sixtus IV, Bulla 28 Feb. 1471/72 "Dum fructus uberes". Add: Clemens IV, Bulla 12 Feb. 1265 "Obtentu divini"