Eridanus, ni, A riuer in Italie now called Padus, in Italian Po, nighe to the Citie called Patauium, so named of Eridanus, called also Phaëton, which was drowned in the same.
Lewis and Short: Latin dictionary
Ērĭdănus, i, m., = *)hridano/s. I.The mythical and poetical name of the river Po, Plin. 3, 16, 20, 117, 120; Verg. G. 4, 372; id. A. 6, 659; Prop. 1, 12, 4; 4 (5), 10, 39; Ov. M. 2, 324; 372; Mart. Cap. 6, 640.— II.The constellation Eridanus, Cic. Arat. 389; Hyg. Astr. 2, 32; Mart. Cap. 8, 838 al.