Bulla erectionis officii dominorum Militum S. Petri de numero participantium nuncupatorum quamplurimis priuilegiis decorati
This is a 1521 papal bull issued in Rome under Pope Leo X, granting privileges to the Knights of St. Peter, a religious military order. The first picture is a roundel with the Latin inscription SACTVS PETRVS PAVLVS, LEO PP X and a ring of text around its edge; the second shows a seated pope surrounded by armoured soldiers beneath the words COLLEGIVM MILITVM S PETRI. A designer might take from them the compact circular seal layout with its quadrants and ring lettering, and the dense crowd of helmeted figures packed around a central throne.
