La bvlle d'indiction de Nostre Sainct Pere Pie par la diuine prouidence Pape IIII. pour la conuocation du sacré concille general à celebrer en la ville de Trente.
A papal bull issued by Pope Pius IV in 1561, printed in Paris by Guillaume Nyverd and Gilles Corrozet to summon the Council of Trent. The pictures are small black-and-white woodcuts on plain letterpress pages: a seal diagram with four monogrammed quadrants inside a circular inscription, and a papal coat of arms with a tiara and crossed keys above a shield of six roundels. A designer might take the compact, symmetrical arrangement of a roundel seal and heraldic emblem as a model for simple, authoritative marks.
