In ancient Greek religion and mythology, Achelous was the god associated with the Achelous River, the largest river in Greece. According to Hesiod, he was the son of the Titans Oceanus and Tethys. He was also said to be the father of the Sirens, several nymphs, and other offspring.
Achelous floor mosaic, Zeugma, Turkey.
Hercules and Achelous in a Roman wall painting from the Hall of the Augustales.
Herakles standing, vanquishing Acheloos who is held kneeling at his feet. Temple of the Oxus, Takht-i Sangin, Bactria, 4th century BCE. National Museum of Antiquities of Tajikistan (M 7249).
The Banquet of Achelous, by Rubens, c. 1615
The Achelous, also Acheloos, is a river in Epirus, western Greece. It is 220 km (137 mi) long. It formed the boundary between Acarnania and Aetolia of antiquity. It empties into the Ionian Sea. In ancient times its spirit was venerated as the river god Achelous.
Achelous River
A Roman fresco from Herculaneum depicting Hercules (from Etruscan Hercle and ultimately Greek Herakles) and Achelous (patron deity of the Achelous River in Greece) from Greco-Roman mythology, 1st century AD