Apollodorus says Argus and Ismene, daughter of Asopus, had a son Iasus who is said to have been the father of Io — but the annalist Castor and many of the tragedians allege that Io was a daughter of Inachus, and Hesiod and Acusilaus say she was a daughter of Piren.2Pseudo-Apollodorus — Bibliotheca 2.1.3⚖Told differently in other tellings — change the lens on the card

Pausanias' Argive king-list makes Iasus son of Triopas and father of Io, who went to Egypt — whether the circumstances be as Herodotus records or as the Greeks say. After Iasus, Crotopus son of Agenor succeeded before Danaus returned from Egypt.3Pausanias — Description of Greece 2.16.1⚖Told differently in other tellings — change the lens on the card

The lineage note preserved at Argos adds that Iasus was father of Io, whom Hera's jealousy drove from the land — and of the twin kings who would divide the kingdom after the age of Danaus.4Pseudo-Apollodorus · Pausanias — Bibliotheca 2.1.3–2.1.4; Description of Greece 2.16.1