romanus pontifex, latin for "the roman pontiff", is a papal bull written in 1454 by pope nicholas v to king afonso v of portugal. as a follow-up to the dum diversas, it confirmed to the crown of portugal dominion over all lands south of cape bojador in africa. along with encouraging the seizure of the lands of saracen turks and non-christians, it repeated the earlier bull's permission for the enslavement of such peoples. the bull's primary purpose was to forbid other christian nations from infringing the king of portugal's rights of trade and colonisation in these regions, particularly amid the portuguese and castilian competition for ascendancy over new lands discovered.
this bull should not be confused with a september 21, 1451 bull by the same name, also written by nicholas v, relieving the dukes of austria from any potential ecclesiastical censure for permitting jews to dwell there.