Note 662 — Chapter IX · CONCLUSION.
Reading edition
S. Raymondi Summ. I. VI. i.—I. Extrav. Commun. I. viii.—Lib. Carolin. III. 1, 3.—Harduin. Concil. IV. 131, 453-4, 747, 775, 970.—Hartzheim Concil. German. I. 390-6.—Eymeric. p. 325.—Tocco, L’Eresia nel Medio Evo, pp. 389-90.—C. 9, 11, Extra, I. xi.
When Sigismund of Austria, in his quarrel with Nicholas of Cusa over the bishopric of Brixen, refused to observe the interdict cast on his territories, Pius II., in 1460, summoned him to trial within sixty days as a heretic, because his disobedience showed him to be notoriously guilty of that heresy of heresies, disbelief in the article of the Creed, “Credo in unam sanctam Catholicam et Apostolicam ecclesiam” (Freher et Struv. II. 192).