Larissa’s family tree depends entirely on which Larissa you mean: in Greek mythology, Larissa was a Thessalian princess, and in astronomy, Larissa is a moon of Neptune. This article covers both, starting with the mythological figure, then the moon’s namesake and its ‘family’ in the solar system.
Who Was Larissa in Greek Mythology?
In Greek mythology, Larissa (also spelled Larisa) was a daughter of Pelasgus, the mythical first king of Arcadia or Argos, depending on the source. Her name was given to the city of Larissa in Thessaly, which she was said to have founded or ruled. The most detailed account comes from the Bibliotheca (Pseudo-Apollodorus), which lists her as the mother of Achaeus, Phthius, and Pelasgus by Poseidon. Some local Thessalian traditions instead made her the daughter of Poseidon and a mortal woman, but the Pelasgus lineage is the most widely cited.
Larissa’s Parents and Siblings
The standard genealogy, as given in the Bibliotheca, places Larissa as the child of Pelasgus and a woman named either Deianira or Meliboea, depending on the manuscript. Pelasgus was the eponymous ancestor of the Pelasgians, the pre-Greek inhabitants of the Aegean. Larissa’s siblings are not consistently named across sources, but in some versions she had a brother named Lycaon, who later became the infamous king of Arcadia known for serving his son to Zeus. In other traditions, Lycaon is her father instead—this confusion is common in mythological genealogies because different city-states claimed different founders.
Larissa’s Children and Grandchildren
Larissa’s most significant role in myth is as the mother of three sons by Poseidon: Achaeus, Phthius, and Pelasgus. These sons became the eponymous ancestors of the Achaeans, the Phthians (inhabitants of Phthia in Thessaly), and the Pelasgians, respectively. Through them, Larissa is the grandmother of several legendary figures, including Hellen (the ancestor of the Hellenes) in some accounts, though Hellen is more commonly the son of Deucalion and Pyrrha. This makes Larissa a key figure in the mythological prehistory of Greece, linking the major ethnic groups to a single divine ancestor.
The Moon Larissa: Namesake and Solar System Family
In modern astronomy, Larissa is the name of the fifth-largest moon of Neptune, discovered in 1981 by Harold Reitsema, William Hubbard, Larry Lebofsky, and David Tholen. The moon was named after the mythological Larissa in 1991, following the convention of naming Neptunian moons after figures from Greek mythology associated with Poseidon (Neptune). Larissa the moon is irregularly shaped, about 194 km across, and orbits Neptune every 0.55 days. Its ‘family’ is the Neptunian system: it is one of seven inner irregular moons, along with Naiad, Thalassa, Despina, Galatea, Proteus, and Hippocamp. These moons are thought to be remnants of a larger moon that was shattered by impacts, so Larissa’s ‘siblings’ are the fragments of that ancient body.
How to Trace Larissa’s Family Tree in Different Sources
If you want to research Larissa’s mythological family, the best approach is to consult primary sources and scholarly commentaries. Start with Pseudo-Apollodorus’s Bibliotheca (Book 3, sections 8–9), which gives the most complete genealogy. Then cross-reference with Hesiod’s Catalogues of Women (fragments) and the Ehoiai, though these are fragmentary. For the moon, NASA’s planetary fact sheets and the IAU’s Gazetteer of Planetary Nomenclature provide accurate orbital data and naming history. Be aware that ancient sources often contradict each other; for example, the historian Dionysius of Halicarnassus makes Larissa the daughter of Poseidon and a different mother, while the poet Hellanicus of Lesbos has a different genealogy entirely. When sources disagree, scholars usually prefer the earliest or the most detailed account, but no single ‘correct’ tree exists.
Common Misconceptions About Larissa’s Family
A frequent mistake is confusing Larissa with another mythological figure of the same name, such as the nymph Larissa who was a lover of Hermes in some Arcadian myths. That Larissa is sometimes said to be the mother of the god Pan, but this is a separate tradition from the Thessalian princess. Another misconception is that Larissa was a goddess—she was a mortal princess, though her divine consort Poseidon made her sons demigods. In astronomy, people often assume Larissa the moon is named after the city of Larissa, but it is named after the mythological princess, as per the IAU’s rule for Neptunian moons. Finally, some sources claim Larissa had a daughter, but no reliable ancient text gives her a daughter; all attested children are sons.
Why Larissa’s Family Tree Matters
Larissa’s genealogy is not just a list of names—it explains how the ancient Greeks understood their own origins. By making Larissa the mother of Achaeus, Phthius, and Pelasgus, the myth ties the three major ethnic groups (Achaeans, Phthians, Pelasgians) to a single maternal ancestor, which reinforced a sense of shared heritage. The city of Larissa in Thessaly used this myth to claim divine foundation, which gave it prestige in Greek politics. In astronomy, the naming of the moon after Larissa continues this mythological tradition, connecting modern science to ancient storytelling. Understanding the family tree helps both classicists and space enthusiasts see how a single name can carry two very different but equally rich ‘families’.
Frequently Asked Questions
Who were Larissa’s parents in Greek mythology?
In the most common version, Larissa was the daughter of Pelasgus, the first king of Argos or Arcadia, and a woman named Deianira or Meliboea. Some local traditions instead made her the daughter of Poseidon, but this is less common.
Did Larissa have any siblings?
Yes, but they are rarely named. In some sources, she had a brother named Lycaon, who became the king of Arcadia. Other traditions list no siblings, and some even make Lycaon her father instead, so the family relationships are not fixed.
Who were Larissa’s children?
Larissa had three sons with the god Poseidon: Achaeus, Phthius, and Pelasgus. These sons were eponymous ancestors of the Achaeans, Phthians, and Pelasgians, respectively.
Is Larissa the moon named after the same Larissa?
Yes, the moon Larissa is named after the mythological princess, following the convention of naming Neptune’s moons after figures associated with Poseidon. The name was officially adopted in 1991.
Why does Larissa’s family tree vary between sources?
Ancient Greek mythology was not standardized; different city-states and poets created their own genealogies to claim ancestry or prestige. For Larissa, the variation likely reflects the rivalry between Thessaly, Argos, and Arcadia, each wanting to claim her as their own.
Is there a modern ‘family tree’ for the moon Larissa?
In astronomy, the moon’s ‘family’ is the Neptunian system. It likely formed from a shattered larger moon, so its ‘siblings’ are the other inner moons like Proteus and Despina. This is a scientific hypothesis, not a mythological genealogy.
Related
- Mors in Roman Mythology: Death Personified
- Ash in Egyptian Mythology: Role and Meaning
- Immortal Woman He in Chinese Mythology
How pages are sourced and corrected: Sources and editorial policy.