POSTU´MIA or POSTUMIA´NA CASTRA, a fortress in Hispania Baetica, seated on a hill near the river Salsum (Hirt. B. Hisp. 8); probably the modern Salado, between Osuñaand Antequera. (Mariana, 3.2; Florez, Esp. S. 10. p. 150, 12. p. 14.)[T.H.D]