Ever wondered why Helen left Menelaos or why her sister cheated on Agamemnon (other than the obvious)? Ancient poetry traced it back to a sin of their father: Schol. Ad Euripides’ Orestes 249):

“Stesichorus says that when Tyndareus was sacrificing to the gods he overlooked Aphrodite. For this reason, the angry goddess made his daughters thrice and twice married abandoners of husbands. The segment reads like this:

“Because when Tyndareus was sacrificing to all the gods
He neglected only the gentle-giving Kyprian
She was enraged and she made the daughters of Tyndareus
Twice and thrice married deserters of husbands.”

A fragment of Hesiod agrees with this (fr. 176):

“Smile-loving Aphrodite
Was enraged when she saw them: then she hung bad fame upon them.
After that, Timandra abandoned Ekhemos and left;
She went to Phyleus who was dear to the holy gods.
And so Klytemnestra abandoned shining Agamemnon
To lie alongside Aigisthos as she chose a lesser husband;
In the same way, Helen shamed the marriage-bed of fair Menelaos…”

Στησίχορός φησιν ὡς θύων τοῖς θεοῖς Τυνδάρεως ᾿Αφροδίτης ἐπελάθετο• διὸ ὀργισθεῖσαν τὴν θεὸν διγάμους τε καὶ τριγάμους καὶ λειψάνδρους αὐτοῦ τὰς θυγατέρας ποιῆσαι. ἔχει δὲ ἡ χρῆσις οὕτως [frg. 26]•
‘οὕνεκά ποτε Τυνδάρεως
ῥέζων πᾶσι θεοῖς μόνης λάθετ’ ἠπιοδώρου
Κύπριδος, κείνα δὲ Τυνδάρεω κούραις
χολωσαμένη διγάμους τε καὶ τριγάμους τίθησι
καὶ λιπεσάνορας’.

καὶ ῾Ησίοδος δέ [frg. 117]•
τῆισιν δὲ φιλομμειδὴς ᾿Αφροδίτη
ἠγάσθη προσιδοῦσα, κακῆι δέ σφ’ ἔμβαλε φήμηι.
Τιμάνδρη μὲν ἔπειτ’ ῎Εχεμον προλιποῦσ’ ἐβεβήκει,
ἵκετο δ’ ἐς Φυλῆα φίλον μακάρεσσι θεοῖσιν•
ὣς δὲ Κλυταιμνήστρη <προ>λιποῦσ’ ᾿Αγαμέμνονα δῖον
Αἰγίσθῳ παρέλεκτο, καὶ εἵλετο χείρον’ ἀκοίτην.
ὣς δ’ ῾Ελένη ᾔσχυνε λέχος ξανθοῦ Μενελάου…

This passage provides an explanation for why the daughters of Tyndareus—Helen and Andromache—were unfaithful: it was Aphrodite’s game from the beginning because their father did not worship her correctly. A few interesting aspects here: first, Helen is “thrice-married” because after Paris dies, she marries Deiphobus (although some accounts associate her with Theseus too). Second, Hesiod’s fragmentary poems seems to be in the process of cataloging women who leave their husbands.

The first woman in the tale is Timandra, who, according to only this passage, was a third daughter of Tyndareus who left her husband Ekhemos, a king of Arcadia. They had a son together, named Leodocus before she eloped with Phyleus. In another fragment from Hesiod (fr. 23) we learn more about the family of Tyndareus and Leda:

“After climbing into the lush bed of Tyndareus
Well-tressed Leda, as fair as the rays of the moon,
Gave birth to Timandra, cow-eyed Klytemnestra,
And Phylonoe whose body was most like the immortal goddesses.
Her…the arrow bearing goddesss
Made immortal and ageless for all days.”

ἣ μὲν [Τυνδαρέου θαλερὸν λέχο]ς εἰσαναβᾶσα
Λήδη ἐ̣[υπλόκαμος ἰκέλη φαέεσσ]ι σελήνης
γείνατ[ο Τιμάνδρην τε Κλυταιμήστρ]ην τε βοῶπ[ιν
Φυλο̣[νόην θ’ ἣ εἶδος ἐρήριστ’ ἀθαν]άτηισι.
τ̣ὴ̣ν[ ἰο]χέαιρα,
θῆκ[εν δ’ ἀθάνατον καὶ ἀγήραον ἤ]ματα πάντ̣[α. (7-12)

Later on in the same fragment –after hearing about the marriage and children of Klytemnestra—we learn about Timandra:

“Ekhemos made Timandra his blooming wife,
The man who was the lord of all Tegea and Arcadia, wealthy in sheep,
A rich man who was dear to the gods.
She bore to him Laodakos, the horse-taming shepherd of the host,
After she was subdued by golden Aphrodite.”

Τιμάνδρην δ’ ῎Εχεμος θαλερὴν ποιήσατ’ ἄκοιτιν,
ὃς πάσης Τεγ[έης ἠδ’ ᾿Αρκαδίης] πολυμήλου
ἀφνειὸς ἤνασ[σε, φίλος μακάρεσσι θ]ε̣ο[ῖ]σ̣ιν•
ἥ οἱ Λαόδοκον̣ μ[εγαλήτορα ποιμέν]α̣ λαῶν
γ]είνα[θ]’ ὑποδμη[θεῖσα διὰ] χρυσῆν ᾿Αφ[ροδίτην (28-31)

This section of the Hesiodic Catalogue of Women seems to be mentioning only Leda’s children with Tyndareus and not those possibly fathered by Zeus (Helen, Kastor, Polydeukes). But we hear nothing of the future of Leda’s attractive daughter Phylonoe (also spelled Philonoe) other than that Artemis made her immortal. The ancient sources? Nothing at all to explain this.