SIGUENZA y GONGORA, Carlos, Mexican , historian, born in the city of Mexico in 1645 ; died there, 22 August, 1700. He studied mathematics and astronomy in his native city under the direction of his father, and in 1660 entered the Company of Jesus. In 1662 he published his first poem. He continued his mathematical and scientific studies, and in 1665 left the Jesuit order, being appointed .chaplain of the hospital " Amor de Dies." There he became intimate with Juan de Alva Ixtlilxotchitl, who put at his disposal the rich collection of documents of his ancestors, the kings of Texcoco, and in 1668 Siguenza began the study of Aztec history and the deciphering of the hieroglyphs and :symbolical writings of the Toltecs. In 1681 he was appointed by Charles II. royal cosmographer and professor of mathematics in the University of Mexico, and in 1693 he was sent by the viceroy, Gaspar de Sandoval (q. v.), to accompany Admiral Andres de Pez on a scientific exploration of the Gulf of Mexico. On his return he entered the Jesuit order again, and, after falling heir to Ixtlilxotchitl's collection of documents, gave the last years of his life in the retirement of the hospital to the . completion of his works on ancient Mexican history. Siguenza was a very prolific writer. His published works include "Primavera Indiana" (Mexico, 1662) ; "Las Glorias de Queretaro," a poem (1668) ; "Libra Astronomica" (1681) ; "Manifiesto filosofico contra los Cometas" (1681) ; "Los infortunios de Alonso Ramirez," describing the adventures of a man that was captured by pirates in the Philippines, but escaped in a boat and was thrown on the coast of Yucatan (1690) ; "Relacion histdrica de los sucesos de la Armada de Barlovento en la isla de Santo Domingo con la quelna del Guarico" (1691) ; "Mercurio Volante d Papel Periodico " (1693) ; and " Descripcion de la bahia de Santa Maria de Galve, alias Panzacola, de la Mobila y del Rio Misisipi "(1694). Of his numerous manuscripts, only fragments were preserved after the expulsion of the Jesuits, but there is a movement on foot to print them. The most interesting are "Historia del Imperio de los Chichimecas," "Genealogia de los Reyes Mexicanos," "Un Fragmento de la Historia antigua de los Indies " (with illustrations), " Calendario de los meses y fiestas de los Mexicanos," "Cidografia Mexi-cana," "Anotaciones criticas a las obras de Bernal Diaz del Castillo y P. Torquemada," and "Historia de la Provincia de Tejas."