In Greek mythology, Eros was the primordial god of lust, love, and intercourse; he was also worshipped as a fertility deity. His Roman counterpart was Cupid. In some myths, he was the son of the deities Aphrodite and Ares, but according to Plato's Symposium he was conceived by Poros (Plenty) and Penia (Poverty) at Aphrodite's birthday. This explains the different aspects of love. Like Dionysus, he was sometimes referred to as Eleutherios, 'the liberator'. His Roman equivalent was Cupid, 'desire', also known as Amor, 'love'. According to tradition which was made by Eratosthenes, Eros was principally the patron of male love, while Aphrodite ruled the love between men and women. His statue could be found in the palaestrae or wrestling schools, one of the principal venues for men to associate with their beloveds, and it was to him that the Spartans sacrificed before battle.