The term 'Mother of Romulus and Remus' refers to three different figures in Roman mythology. Ilia was the mortal mother of the twins, RHEA was their divine mother, and RHEA Silvia was their great-grandmother. Ilia was a Vestal Virgin who was impregnated by the god Mars, making her the mortal mother of the twins. RHEA was the goddess of motherhood and fertility, and was the divine mother of the twins. RHEA Silvia was the daughter of Numitor, the former king of Alba Longa, and was the great-grandmother of the twins.