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In Greek Mythology, what Was the Hydra?

Mary McMahon
Updated May 23, 2024
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The Hydra or Lernaean Hydra was a many headed monster in Greek mythology which terrorized visitors near the lake of Lerna in Greece. Killing the Hydra proved to be quite a challenge, as two heads would grow back whenever one was cut off. Hercules seized upon the idea of cauterizing the neck before the new heads had a chance to grow, ultimately defeating the monster as part of a series of tasks he completed which are collectively known as the 12 labors of Hercules. The Hydra is such an enduring mythological figure that the term “hydra” is sometimes used to describe a challenge which seems to keep getting bigger and harder to handle, no matter how hard someone tries to metaphorically behead it.

In most stories, the Hydra is the child of Typhon and Echidna, and the monster was put in place to guard an entrance to the underworld. The monster has been described as having anywhere from five to “a multitude” of heads, although in many stories nine heads is the accepted number. In addition to having multiple heads, the Hydra also had poisonous breath and blood, making it an undoubtedly formidable opponent. The many headed serpent was related to other nasty characters in Greek mythology including the Chimera and Cerberus, the many headed dog.

According to legend, Hercules bested the Hydra with the assistance of his relative Iolaus. He approached the Hydra with a cloth over his nose to protect himself from the monster's breath, and while he cut off the Hydra's heads, Iolaus burned the neck stumps with a blazing torch. After the two succeeded in the task of killing the Hydra, Hercules dipped his arrows in the poisonous blood and then they buried the monster, positioning a large rock over it in case it got any ideas about coming back from the dead.

Visual depictions of the Hydra vary immensely, although most give the monster the body of a serpent with heads like snakes, lizards, or dragons. These heads often have vicious teeth and horns to further convey the danger of tangling with the Hydra.

According to some tales, this feat of Hercules was not formally recognized, because he required assistance to complete it. Hercules completed a number of other daring tasks, including capturing Cerberus and capturing the Cretan Bull. The 12 labors of Hercules were undertaken as a form of penance, and they have become a popular theme in tales of heroism and atonement from other regions of the world.

Language & Humanities is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Mary McMahon
By Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a Language & Humanities researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

Discussion Comments
By anon271727 — On May 28, 2012

@anon249558: Spot on.

By anon249558 — On Feb 21, 2012

@FitzMaurice: So, a man turning water to wine is not a myth?

Greek mythology is not pagan.

I wish he was saying that biblical ideas are mythical.

By Proxy414 — On Nov 22, 2010


No I did not mean to offend, but even the Bible itself attests that it draws from mythological sources, not to mimic, but to outdo the other mythologies. For instance, the twelve plagues in Egypt each relate to a specific Egyptian god, and it seems that the writers of the Bible were intentionally making reference (maybe a mocking one) to various "pagan" spiritual figures.

By FitzMaurice — On Nov 22, 2010


It is interesting that you bring up those points, but are you suggesting that Biblical ideas are somehow mythological? I think that comparing the truths of Scripture to pagan mythology is offensive.

By Proxy414 — On Nov 22, 2010

Mythical beings were made to look more fierce and otherworldly by having more heads and faces included in their anatomy. The god Janus had many faces looking in various directions and biblical beasts are often depicted with heads of various animals. In many mythologies, such fierce demons and invulnerable beings of multiple minds were particularly intimidating, requiring some sort of a hero figure, such as Hercules, Beowulf, or Jesus, to slay such a dragon and save the world.

Mary McMahon
Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a...

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