A wandering Italian, Gregorio Leti, has given the Vita di Sisto-Quinto (Amstel. 1721, 3 vols. in 12mo), a copious and amusing work, but which does not command our absolute confidence. Yet the character of the man, and the principal facts, are supported by the annals of Spondanus and Muratori (A.D. 1585-1590), and the contemporary history of the great Thuanus (l. lxxxii. c. 1, 2, l. lxxxiv c. 10, l. c. c. 8).