Gualberto Antonio Castro (July 12, 1934, born on Saint Juan Gualberto day, (St. John Gualbert, in English) in Mexico City) is of Mexican and Lebanese ancestry from his father side of the family and French and Mexican descent from his mother's side, Gualberto is a Mexican singer-entertainer best known for singing with Los Hermanos Castro aka ("The Brothers Castro") and for hosting the television program La Carabina de Ambrosio.