The Diploma of the Joannites, or Diploma of the Knights of St. John, was a grant issued in 1247 by King Béla IV of Hungary to Grand Master Rembald of the Knights Hospitaller. It allowed the Knights to settle in the Severin region, where they could defend the Hungarian frontier against Cuman, Wlach invading tribes, as well as the expansive reach of the Serbian despotate.