Source Verification: The Twelve Labors of Heracles
Every claim below is either what a named ancient source attests, in its own line or section, or a point where the sources themselves disagree.
What the Sources Attest
Why does the story start with Heracles killing his own children?
Hera, hostile to Heracles from birth as Zeus's son by a mortal woman, sent a fit of madness on him that made him kill his wife Megara and their children without recognizing them. The Labors are his penance for that act, imposed by the Oracle at Delphi rather than chosen by him - the whole sequence is framed as punishment and purification, not as a quest he volunteered for.
Source: Apollodorus, Library 2.4.12
Why couldn't Heracles just refuse to serve Eurystheus?
The Oracle at Delphi named the terms directly: serve Eurystheus for a set period and perform whatever labors he set, and only then would Heracles be purified of killing his family. Refusing the labors meant refusing the one path back to a clean state the gods themselves had named, which is why even a hero far stronger than his cousin-king submits to him for the length of the story.
Source: Apollodorus, Library 2.4.12
Which labor is considered the hardest?
Ancient sources do not rank them. In Apollodorus the twelfth and final labor is capturing Cerberus from the underworld, the one task that takes Heracles into the realm of the dead and back, a boundary no earlier labor crossed. That placing is not universal: Diodorus Siculus sends him for Cerberus first and makes the golden apples of the Hesperides his last labor. So Cerberus reads as the climax only in the order Apollodorus preserves.
Source: Apollodorus, Library 2.5.12
Did Heracles do the labors alone?
Mostly, but not entirely, which is exactly why two labors got disqualified. His nephew Iolaus helped cauterize the Hydra's necks so new heads could not grow back, and Heracles arranged payment from King Augeas for clearing the stables. Eurystheus ruled both labors invalid on those grounds and required two replacements, which is the reason the canonical list has twelve entries instead of the original ten.
Source: Apollodorus, Library 2.5.11
How did Heracles get the Golden Apples of the Hesperides without picking them himself?
Only the Titan Atlas, condemned to hold up the sky, or someone with his approval, could safely gather the Hesperides' apples. Heracles offered to hold the sky himself while Atlas fetched them. Atlas, once free, tried to leave Heracles holding the sky permanently and deliver the apples to Eurystheus in person; Heracles tricked him back into position by asking him to hold the sky briefly while he adjusted his cloak, then walked off with the apples.
Source: Apollodorus, Library 2.5.11
Was the list of twelve labors always the same twelve?
No. The fixed sequence of twelve, in the familiar order, is a later standardization; earlier vase painting and poetry treat many of the same feats as independent stories, sometimes include different tasks, and do not agree on the order. Apollodorus's account is the fullest connected version and the one most later retellings follow, but it postdates the earliest tellings by centuries.
Source: Diodorus Siculus, Bibliotheca Historica 4.11-4.26
Where Accounts Differ
- labor list variant
- The canonical list of twelve labors was standardized relatively late. Earlier sources vary on which tasks were included and in what order.
Sources
- Apollodorus, Library 2.5.1-2.5.12
- Euripides, Heracles
- Diodorus Siculus, Bibliotheca Historica 4.11-4.26
- Emma Stafford, Herakles (2012)
- Timothy Gantz, Early Greek Myth (1993)