In Hesiod's Theogony, the river gods are the offspring of the Titans Oceanus and Tethys, and the brothers of the Oceanids.
In Greek mythology, river deities – such as Inachus, Scamander, and Peneus – are often progenitors of local genealogical lines.
During military campaigns into foreign territory, there is evidence of sacrifices having been made to rivers upon their crossing.
[3] Depictions of river deities in ancient Greek art often combine anthropomorphic features with bull-like elements such as horns.
Ancient Greek poet Hesiod mentioned several river gods by name, along with their origin story, in Theogonia[11] ("the birth of the gods"):And Tethys bare to Ocean eddying rivers, Nilus, and Alpheus, and deep-swirling Eridanus, Strymon, and Meander, and the fair stream of Ister, and Phasis, and Rhesus, and the silver eddies of Achelous, Nessus, and Rhodius, Haliacmon, and Heptaporus, Granicus, and Aesepus, and holy Simois, and Peneus, and Hermus, and Caicus fair stream, and great Sangarius, Ladon, Parthenius, Euenus, Ardescus, and divine Scamander.