Orthrus

Overview

The Library identifies the hound as an offspring of Typhon and Echidna and assigns him two heads. His responsibility is the protection of Geryon’s red cattle, alongside the herdsman Eurytion. When Heracles reaches the island of Erythia, the dog detects him and rushes to meet the intruder, beginning the violence that makes the cattle accessible.

Heracles kills the hound with his club, then defeats Eurytion and Geryon. Orthrus therefore has a specific role in a guarded household and herd, distinct from Cerberus’s relationship with the dead. Translators may use Orthus rather than Orthrus; that spelling variation does not create another creature. A comparison of the two hounds is useful only if their different duties and narrative settings remain visible.

In the Library’s tenth labour, Erythia is an ocean island identified by the narrator with Gadira. Heracles reaches it using the Sun’s golden cup and lodges on Mount Abas. Orthus detects him and charges before Eurytion intervenes. The herdsman Menoetes, pasturing Hades’ cattle there, survives to inform Geryon. The owner confronts the departing cattle-raider beside the river Anthemus and is shot dead. The hound’s death is thus the opening of a longer herd-taking sequence; it is not a narrated escape from an underworld gate.

Hesiod’s Theogony 306–332 places Orthus first among Echidna and Typhaon’s offspring and calls him Geryones’ hound, but does not give his head count in that passage. Later in the same sequence Echidna’s union with Orthus produces the Sphinx and Nemean lion. That reproductive role supplements his guardianship in the Library without establishing a single harmonised genealogy across all ancient sources. The two-headed description belongs explicitly to Library2.5.10.

Origins & earliest records

This entry follows The Library, Book II, at 2.5.10, in the linked English translation. The work preserves a particular ancient narrative rather than establishing the first appearance of every motif. Its composition period dates a surviving literary witness; older oral transmission and earlier artistic evidence require separate investigation.

Records & interpretation

Ancient poem and mythographer provide a named herd-guardian, explicit two-headed form in the Library, and a separate poetic genealogical role.

In the literature

Selected bibliography

Documented works and useful reading. This is not a list of every appearance.

1. 01

   The Library, Book II, 2.5.10

   Pseudo-Apollodorus; translated by James George Frazer · c. 1st–2nd century CE; translation 1921

   Selected primary passage; wording is summarized independently, and incompatible later versions are not silently combined.

2. 02

   Theogony, lines 306–332

   Hesiod; translated by Hugh G. Evelyn-White · Archaic Greek poem; translation 1914

   Geryones’ hound and Echidna union; passage does not specify Orthus’s head count.

3. 03

   Theogony, in Hesiod, the Homeric Hymns, and Homerica

   Hesiod · 1914

   Historical English translation; translator’s preface dated 9 September 1914. Gutenberg includes the English portions and relocated footnotes.

4. 04

   The Library (Bibliotheca)

   Pseudo-Apollodorus · 1921

   Pseudo-Apollodorus, The Library, James George Frazer translation, Loeb Classical Library 121–122; Harvard University Press / William Heinemann, 1921.

Family, evolution & connections

Textual genealogy: Typhaon and Echidna in Theogony

The three sequentially enumerated offspring at Theogony lines 306–318.

Follow the explicitly named pairing of Typhaon and Echidna and the first, second and third offspring in Evelyn-White's translation. Selected parentage in Hesiod. Typhaon is the name used here for Typhon. Later Chimera and Sphinx passages involve interpretive pronoun questions; those are not silently appended. Hera's nourishment of Hydra is not maternity. No claim of zoological ancestry.

Textual genealogy: selected children of Typhon and Echidna in Library

Explicit named parentage in Library 2.3.1, 2.5.10, 2.5.11 and 3.5.8.

Combine four explicit parentage statements within one named work, keeping each creature under the stated Typhon–Echidna pair. This is a selected version attributed to Pseudo-Apollodorus. The Hesperides' dragon is identified with the Ladon profile, although this passage calls it the dragon rather than using that name. Hesiod gives that dragon different parents; the alternative remains separate. Sphinx means the Greek figure. Fosterers, killers and owners are not parents.

Located primary passages

Specific passages supporting details in this entry, grouped by their published witness.

References

Sources supporting this profile. Linked pages have their own scope and editorial standards.

1. Primary textThe Library, Book II: 2.5.10 (Theoi Classical Texts Library or Project Gutenberg transcription)Research access: 2026-10-05
2. Primary ancient text in historical translationTheogony, lines 306–332Research access: 2026-10-05

Image credits

Orthrus

Image associated with the exact linked encyclopedia article; consult credited file description for its interpretation.