Alfonso Caso (älfōn´sō kä´sō), 1896–1970, Mexican archaeologist. An authority on the ancient high civilizations of Mexico, he directed explorations at Mitla and Monte Albán during the 1920s and 30s. Among his many books and articles are The Religion of the Aztecs (tr. 1937), Thirteen Masterpieces of Mexican Archeology (tr. 1938), and The Aztecs: People of the Sun (tr. 1958).