OLMOS, Francisco Andres de (ole'-mos), Spanish missionary, born in Burgos, Spain, toward the end of the 15th century; died in Tampico, Mexico, 8 October, 1571. He studied in the University of Valladolid and entered the Franciscan order. Through his proficiency in theology he became acquainted with the superior of the convent of Abrojo, Zumarraga, and when the latter was appointed bishop of Mexico in 1528, Ohnos accompanied him. In order to fit himself for missionary work, he studied the native languages and soon spoke them perfectly. He now travelled on foot through Huaxteca over the mountains of Tuxpan to Panuco and to the confines of Florida, converting the Indians. He afterward was called for some time to the principal convent of Mexico, and while there composed many of his works in the Indian dialects, and also a kind of drama on the final judgment, in the Mexican language, which was represented before the viceroy Mendoza. Later he obtained permission to return to his missions, and died in the convent of Tampico. He wrote " Arte de la lengua Mexicana," from which Torquemada learned the Mexican language (Mexico, 1555); " Vocabulario Mexicano," of which the original manuscript is in the College of San Gregorio, in Tlalnepantla; " Arte y Vocabulario de la lengua Huaxteca," of which the manuscript is in the convent of Ozoluama ; "Arte y Vocabulario de la lengua Totonaca"; Arte y Vocabulario de la lengua Tepehuana"; " Platicas de las Serioras Mexicanas con sus hijas, "translated by Francisco Clavigero ; and several treatises on the capital sins, sacraments, and sacrileges, in the Mexican language, the manuscripts of which were preserved in the library of Tlaltelolco, in Mexico. According to Leon Pinelo, he also wrote a treatise on Mexican antiquities.