Salinas y Rodríguez was the son of Pedro Gómez Salinas and Agustina Rodríguez de Villarroel, aristocrats of the small nobility (from Burgos, by his father's side and Valladolid, by his mother's side).
Salinas y Rodríguez era fillo de Pedro Gómez de Salinas e Agustina Rodríguez de Villarroel, aristócratas da pequena nobreza (de Burgos, polo pai e Valladolid, polo lado da súa nai).