According to Hesiod, there were three thousand (i.e. innumerable) river gods. These included: Achelous, the god of the Achelous River, the largest river in Greece, who gave his daughter in marriage to Alcmaeon and was defeated by Heracles in a wrestling contest for the right to marry Deianira; Alpheus, who fell in love with the nymph Arethusa and pursued her to Syracuse where she was transformed into a spring by Artemis; and Scamander who fought on the side of the Trojans during the Trojan War and got offended when Achilles polluted his waters with a large number of Trojan corpses, overflowed his banks nearly drowning Achilles.