Clement IX. (Giulio Rospigliosi) was born in 1600, became successively auditor of the Rota, archbishop of Tarsus in partibus, and cardinal, and was elected pope on the 20th of June 1667. He effected a temporary adjustment of the Jansenist controversy; was instrumental in concluding the peace of Aix-la-Chapelle (1668); healed a long-standing breach between the Holy See and Portugal; aided Venice against the Turks, and laboured unceasingly for the relief of Crete, the fall of which hastened his death on the 9th of October 1669.
See Oldoin, continuator of Ciaconius, Vitae et res gestae summorum Pontiff. Rom.; Palazzi, Gesta Pontiff. Rom. (Venice, 1687–1688), iv. 621 seq. (both contemporary); Ranke, Popes (Eng. trans. Austin), iii. 59 seq.; and v. Reumont, Gesch. der Stadt Rom, iii. 2, 634 seq. (T. F. C.)