As Pope Pius II, Enea Silvio Piccolomini was head of the Catholic Church from 1458 to 1464. He was an important humanist scholar, orator and poet. As pope, he vehemently appealed for a crusade against the Ottoman Empire. However, no such crusade materialized.
Jean-Jacques Boissard (1528–1602), portrait of Enea Silvio Piccolomini (1405–1464), copper engraving, 1669; source: Bibliotheca chalcographica, hoc est Virtute et eruditione clarorum Virorum Imagines, Heidelberg 1669, digitalization by the University of Mannheim, MATEO, http://www.uni-mannheim.de/mateo/desbillons/aport/seite32.html.