The longest river in Italy (c.400 miles). See generally OCD4 Padus.
For the name Eridanos see eta 516, again at iota 597. The earliest detailed description of the Po is in Polybius 2.6-15, and Walbank ad loc. (178-9) briefly discusses the Pados/Eridanos connection, which is more complex than the Suda suggests. Early writers (Hesiod, Herodotus) applied the name Eridanos to a fabulous amber-producing river; later this was thought to be near, rather than identical with, the Po (still so in e.g. Strabo 5.1.9); the simple identification, probably attributable to Apollonius of Rhodes, never ousted alternatives.