Aquaviva, Claudio the fourth general of the Jesuits, was born Sept. 14, 1543, joined the Jesuits in 1568, and was elected, in 1581, their general. The order considerably gained, under his administration, in influence and extension. He wrote Epistole XVI, and Industrice ad curandos animce morbos (Ven. 1606). He also superintended the compilation of the "ratio studiorum" and the "directorium exercitorum St. Ignatii," which have ever since been regarded as standard works of the order. He died Jan. 31, 1615. SEE JESUITS.