This chapel was built by Hungarian Augustinian monks in honor of the Order's founder San Paolo I Eremita, when Pope Nikolaus V gave the Church to them in May 1454. However, neither the altar nor the decoration are original, but of more recent date, when in 1776 Pope Pius VI ordered that a new chapel be built in the Church where the students of the Collegio Germanico Ungarico could celebrate their saint, Santo Stefano d'Ungheria. It was especially popular among expatriates when Hungary was under the Communists, since the heroic archbishop Jósef Mindszenty was the cardinal here.