Pausanias 10.28.2:
Polygnotus followed, I think, the poem called the Minyad. For in this poem occur lines referring to Theseus and Peirithous:—“Then the boat on which embark the dead, that the old Ferryman, Charon, used to steer, they found not within its moorings.” The Minyad, an unknown work.For this reason then Polygnotus too painted Charon as a man well stricken in years. (Original Greek)
There is another tradition, very different from the first, that Hesiod wrote a great number of poems; the one on women, the one called the Great Eoeae, the Theogony, the poem on the seer Melampus, the one on the descent to Hades of Theseus and Perithous, the Precepts of Chiron, professing to be for the instruction of Achilles, and other poems besides the Works and Days. (Original Greek)
Hesiod, fr. 280 MW (Fragmenta Hesiodea, eds. R. Merkelbach and M. L. West [1967], p. 139-40):
“…to destroy me by violence and his great spear, but ruinous Fate and Leto’s son destroyed me. But come now! Tell me this thoroughly…you arrived in Hades…your trusty companion followed together…what according to need…first, tell the story”…”towards the people’s shepherd…the horrid goddess, the Fury, o Zeus-born Meleager, son of warlike Oineus, therefore I shall explain this very precisely…noble Persephone…Zeus, delighting in thunder, so that he might betroth his wife by the gods’ customs…they say they were siblings…to woo and to wed apart from their dear parents…by the gods he swears to marry his own sister by the same father. For he says that he himself was nearly born of great Hades to Persephone, daughter of fair-haired Demeter. He says that he himself, a brother and of the same father…dear Hades has prepared his patrimony. On account of this, he said, we went underneath the murky darkness.” So he spoke, and Meleager was horror-struck when he heard the story. He answered, speaking with soothing words, “Theseus, adviser of the Athenians, armed with breastplates…if the thoughtful wife…of great-spirited Peirithous…” (translated by Aaron J. Ivey)
Olympia, Archaeological Museum B 4198/9 (not B 2198, as in text): bronze shield-band relief with Theseus and Peirithoos in Hades
Polygnotos’ Nekuia painting at Knidian Lesche, Delphi (known through Pausanias’ description and modern reconstructions)
Lower down than Odysseus are Theseus and Peirithous sitting upon chairs. The former is holding in his hands the sword of Peirithous and his own. Peirithous is looking at the swords, and you might conjecture that he is angry with them for having been useless and of no help in their daring adventures. Panyassis the poet says that Theseus and Peirithous did not sit chained to their chairs, but that the rock grew to their flesh and so served as chains (original Greek).
Detail with Theseus and Peirithoos, from C. Robert’s reconstruction of Polygnotos’ Nekuia, J.G. Frazer, Pausanias’s Description of Greece, vol. V, Commentary (2nd ed. 1913), pl. opposite p. 372.
Panyasis Herakleia, fr. 14 PEG (Poetae Epici Graeci, ed. A. Bernabé [1987], p. 179):
Panyassis the poet says that Theseus and Peirithous did not sit chained to their chairs, but that the rock grew to their flesh and so served as chains (as written by Pausanias).
Edited by Aaron J. Ivey, Graduate Teaching Assistant, Department of Classics, Univ. of Georgia, June 2016; and Frances Van Keuren, Prof. Emerita, Lamar Dodd School of Art, Univ. of Georgia, July 2016.
Gantz, Early Greek Myth (1993) 