Porfirio Rubirosa Ariza was born in 1909 in
San Francisco de Macorís, the third and youngest child of an upper-middle-class
Criollo family. His parents were Pedro María Rubirosa and Ana Ariza Almánzar. The eldest child was named Ana and the elder son was named César. His paternal grandparents were, Pedro Rovirosa, a Catalan immigrant, and María de la Paz Rossi, the daughter of an Italian immigrant. His maternal grandparents were Buenaventura Ariza y Castillo, who was from the provincial elite, and María Dolores Almánzar.