Castagnares, Agostinho a Roman Catholic missionary, was born Sept. 25,1687, at Palta, in Paraguay. He was educated by the Jesuits, and entered their society when a youth. It was intended by his superiors that he should preach the faith to the savages, and being placed among the Chiquitas and Guaranis, he succeeded in converting a part of the Samuques tribe. He then went to the Mataguais, among whom he had already made some converts, when he was killed by the cacique of the tribe, Sept. 15, 1744. See Hoefer, Nouv. Biog. Géneralé, s.v.