Berlin, Antikensammlung 30035, Attic red-figure lekythos with Peirithoos in Hades
Euripides Herakles 1169-70:
Wherefore I came making recompense for the former kindness of Heracles in saving me from the world below… (original Greek)
Critias, fr. 6 Snell (Tragicorum Graecorum Fragmenta, ed. Bruno Snell , p. 175):
This was the case of Theseus, who for the sake of his dear Pirithous shared his punishment, and was bound with him in the same eternal chains (as written by Plutarch in De amicorum multitudine)
*Horace Odes 3.4.79-80:
Three hundred chains confine the lover, Pirithous (translated by Aaron J. Ivey)
Horace Odes 4.7.27-28:
…and Theseus is not strong enough to break the Lethaean chains from dear Pirithous (translated by Aaron J. Ivey).
Apollodorus Epitome 1.24:
But when Theseus arrived with Pirithous in Hades, he was beguiled; for, on the pretence that they were about to partake of good cheer, Hades bade them first be seated on the Chair of Forgetfulness, to which they grew and were held fast by coils of serpents. Pirithous, therefore, remained bound for ever, but Hercules brought Theseus up and sent him to Athens. Thence he was driven by Menestheus and went to Lycomedes, who threw him down an abyss and killed him (original Greek).
Edited by Aaron J. Ivey, Graduate Teaching Assistant, Department of Classics, Univ. of Georgia, June 2016; and by Frances Van Keuren, Prof. Emerita, Lamar Dodd School of Art, Univ. of Georgia, July 2016.