LOS SANTOS, Thomas de, clergyman, born in Cordova, Argentine Republic, in 1826 ; died in Buenos Ayres in 1868. He was educated in Buenos Ayres, and in 1840 entered the Dominican order in the convent of Cordova, where he gave such evidences of superior intelligence that he was appointed professor of theology and philosophy at the age of twenty. He was ordained priest in 1850, and appointed successively regent of studies, sub-prior, and master of novices in his convent. In 1860 he was ordered to Mendoza to organize the studies in the convent of that city. While he was lecturing before his brethren there was an earthquake, destroying the convent as well as the whole city, and burying the greater part of the monks under the ruins. He made heroic efforts during the catastrophe, and saved several lives. In 1860 he was summoned to Buenos Ayres; but, as he insisted on making the journey on foot, it took him two years to reach the capital. Travelling across the pampas, he acted as missionary on the way, converting several Indian tribes. He was elected prior of the convent of Buenos Ayres in 1862, and in 1867 was appointed provincial of his order in the Argentine Republic. Shortly after his appointment there was an outbreak of cholera, and he devoted himself entirely to the service of the sick, until he himself became a victim. He wrote several works, the principal of which are "El Tercero Instruido" and "Metodo Spiritual."