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Argus and Ismene, daughter of Asopus, had a son Iasus, who is said to have been the father of Io.1 But the annalist Castor and many of the tragedians allege that Io was a daughter of Inachus;2 and Hesiod and Acusilaus say that she was a daughter of Piren. Zeus seduced her while she held the priesthood of Hera, but being detected by Hera he by a touch turned Io into a white cow3 and swore that he had not known her; wherefore Hesiod remarks that lover's oaths do not draw down the anger of the gods. But Hera requested the cow from Zeus for herself and set Argus the All-seeing to guard it. Pherecydes says that this Argus was a son of Arestor;4 but Asclepiades says that he was a son of Inachus, and Cercops says that he was a son of Argus and Ismene, daughter of Asopus; but Acusilaus says that he was earth-born.5 He tethered her to the olive tree which was in the grove of the Mycenaeans. But Zeus ordered Hermes to steal the cow, and as Hermes could not do it secretly because Hierax had blabbed, he killed Argus by the cast of a stone;6 whence he was called Argiphontes.7 Hera next sent a gadfly to infest the cow,8 and the animal came first to what is called after her the Ionian gulf. Then she journeyed through Illyria and having traversed Mount Haemus she crossed what was then called the Thracian Straits but is now called after her the Bosphorus.9 And having gone away to Scythia and the Cimmerian land she wandered over great tracts of land and swam wide stretches of sea both in Europe and Asia until at last she came to Egypt, where she recovered her original form and gave birth to a son Epaphus beside the river Nile.10 Him Hera besought the Curetes to make away with, and make away with him they did. When Zeus learned of it, he slew the Curetes; but Io set out in search of the child. She roamed all over Syria, because there it was revealed to her that the wife of the king of Byblus was nursing her son;11 and having found Epaphus she came to Egypt and was married to Telegonus, who then reigned over the Egyptians. And she set up an image of Demeter, whom the Egyptians called Isis,12 and Io likewise they called by the name of Isis.13

1 Compare Paus. 2.16.1; Scholiast on Eur. Or. 932.

2 Compare Aesch. PB 589ff.; Hdt. 1.1; Plut. De Herodoti malignitate 11; Lucian, Dial. Deorum iii.; Lucian, Dial. Marin. vii.1; Paus. 3.18.13; Ov. Met. 1.583ff.; Hyginus, Fab. 145.

3 Compare Aesch. Supp. 291ff.; Scholiast on Hom. Il. 2.103 (who cites the present passage of Apollodorus); Ov. Met. 1.588ff.

4 The passage of Pherecydes is quoted by the Scholiast on Eur. Ph. 1116.

5 So Aesch. PB 305.

6 Compare Scholiast on Aesch. Prom. 561; Scholiast on Hom. Il. ii.103.

7 That is, slayer of Argus.

8 For the wanderings of Io, goaded by the gadfly, see Aesch. Supp. 540ff., Aesch. PB 786(805)ff.; Ov. Met. 1.724ff.

9 Bosphoros, ”Cow's strait” or ” Oxford.”

10 Compare Aesch. PB 846(865)ff.; Hdt. 2.153 Hdt. 3.27; Ov. Met. 1.748ff.; Hyginus, Fab. 145.

11 Isis, whom the ancients sometimes identified with Io (see below), is said to have nursed the infant son of the king of Byblus. See Plut. Isis et Osiris 15ff. Both stories probably reflect the search said to have been instituted by Isis for the body of the dead Osiris.

12 For the identification of Demeter with Isis, see Hdt. 2.59, Hdt. 2.156; Diod. 1.13.5, Diod. 1.25.1, Diod. 1.96.5.

13 Herodotus remarked (Hdt. 2.41) that in art Isis was represented like Io as a woman with cow's horns. For the identification of Io and Isis, see Diod. 1.24.8; Lucian, Dial. Deorum iii.; Clement of Alexandria, Strom. i.21.106, p. 382, ed. Potter; Prop. iii.20.17ff.; Juvenal vi.526ff.; Statius, Sylv. iii.2.101ff.; Hyginus, Fab. 145.

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