{
  "id": "poseidon-vs-neptune",
  "type": "comparison",
  "name": "Poseidon vs Neptune",
  "summary": "Is Neptune the same as Poseidon? In myth, yes — Ovid's Neptune floods the earth with the trident and Virgil's Neptune calms the storm as the brother who won the sea by lot. In cult, no — Livy's Romans hold games for \"Equestrian Neptune\", the Consualia, at which the Sabine women are seized; no Greek text ties Poseidon to that.",
  "locale": "en",
  "tags": [
    "comparative",
    "comparisons",
    "greek",
    "roman",
    "sea-gods"
  ],
  "relations": [
    {
      "rel": "compares",
      "target": "poseidon"
    },
    {
      "rel": "compares",
      "target": "neptune"
    },
    {
      "rel": "discussed_in",
      "target": "greek-and-roman-gods-equivalence-table"
    },
    {
      "rel": "related",
      "target": "interpretatio-romana"
    }
  ],
  "questions": [
    "Is Neptune the same as Poseidon?",
    "What is the difference between Poseidon and Neptune?",
    "How did Poseidon get the sea?",
    "What is the Consualia?",
    "Did Neptune build the walls of Troy?"
  ],
  "claims": [
    {
      "id": "c1",
      "text": "The lot is shared: Homer's Poseidon says \"I verily, when the lots were shaken, won for my portion the grey sea to be my habitation for ever\" (Il. 15.187–193); Virgil's Neptune tells the winds that \"dominion o'er the seas and trident dread … unto me, Fate gives\" (Aen. 1.124–156); Ovid calls him Jove's \"azure brother, lord of flowing waves\" (Met. 1.253–312).",
      "sources": [
        "homer-iliad",
        "virgil-aeneid",
        "ovid-metamorphoses"
      ],
      "confidence": 0.93
    },
    {
      "id": "c2",
      "text": "The trident and the earthquake are shared: Hesiod names him \"the loud-crashing Earth-Shaker\" (Theog. 456), the Hymn \"mover of the earth and fruitless sea\" (HH22 1–7), and Apollodorus has the Cyclopes give him the trident (Apollod. 1.2.1); Ovid's Neptune \"with his trident smote the Earth, which trembling … heaved up the sources of her waters\" (Met. 1.253–312), and Virgil's Neptune \"strikes the wall; his trident vast makes her foundation tremble\" at Troy (Aen. 2.567–623).",
      "sources": [
        "hesiod-theogony",
        "homeric-hymns",
        "apollodorus-library",
        "ovid-metamorphoses",
        "virgil-aeneid"
      ],
      "confidence": 0.92
    },
    {
      "id": "c3",
      "text": "The storm is the same god's work on opposite sides: Homer's Poseidon \"seizing his trident in his hands troubled the sea, and roused all blasts of all manner of winds\" against Odysseus (Od. 5.282–296); Virgil's Neptune, seeing \"Saturnian Juno's vengeful stratagem\", rebukes the winds and calms the sea for Aeneas (Aen. 1.124–156). Both poets place the storm-winds under a king who must answer to the sea-god.",
      "sources": [
        "homer-odyssey",
        "virgil-aeneid"
      ],
      "confidence": 0.9
    },
    {
      "id": "c4",
      "text": "The walls of Troy are a Greek story Virgil keeps: Homer's Poseidon reminds Apollo \"I verily built for the Trojans round about their city a wall, wide and exceeding fair\", and that Laomedon cheated them of their hire (Il. 21.441–457); Virgil's Venus shows Neptune unseating \"the city from her throne\" with the very trident (Aen. 2.567–623).",
      "sources": [
        "homer-iliad",
        "virgil-aeneid"
      ],
      "confidence": 0.9
    },
    {
      "id": "c5",
      "text": "The cult is Roman: Romulus \"made elaborate preparations for the celebration of games in honour of 'Equestrian Neptune,' which he called 'the Consualia'\", and used them to seize the Sabine women (Livy 1.9.6–13). The Hymn does give Poseidon the office \"to be a tamer of horses\" (HH22 4–5), but no Greek text here attaches a Roman festival or a name like Consus to him.",
      "sources": [
        "livy-ab-urbe-condita-1",
        "homeric-hymns"
      ],
      "confidence": 0.9
    }
  ],
  "takeaways": [
    "Same god — lot, trident, earthquake and storm are Homer's and Hesiod's, retold by Ovid and Virgil under the Latin name.",
    "Same wall — Virgil's Neptune destroys the Trojan wall that Homer's Poseidon built.",
    "Different cult — \"Equestrian Neptune\" and the Consualia are Livy's Rome, with the Sabine women as the point of the story."
  ],
  "faqs": [],
  "evidence_tier": "primary",
  "evidence": {
    "level": "theoretical",
    "source_types": [
      "paper"
    ]
  },
  "moat_flag": false,
  "winning_edge": "Binds the equivalence to the lot in the Iliad and the trident in Ovid, and isolates the one Roman-only item — Livy's Consualia — instead of listing attributes.",
  "confidence": 0.9,
  "last_verified": "2026-09-03",
  "body": "# Poseidon vs Neptune\n\n## Where they are the same: the lot, the trident, the storm\n\nHomer's Poseidon states his title: \"when the lots were shaken, won for my\nportion the grey sea\" (Il. 15.187–193). Virgil's Neptune states it to the\nwinds: \"Not unto him dominion o'er the seas and trident dread, but unto\nme, Fate gives\" (Aen. 1.124–156). Ovid needs no speech: Jove \"brought to\naid his azure brother, lord of flowing waves\" (Met. 1.253–312).\n\nThe instrument is the same. Hesiod calls him \"the loud-crashing\nEarth-Shaker\" (Theog. 456); the Hymn, \"mover of the earth and fruitless\nsea\" (HH22 1–7); Apollodorus has the Cyclopes give him the trident\n(Apollod. 1.2.1). Ovid's Neptune \"with his trident smote the Earth, which\ntrembling with unwonted throes heaved up the sources of her waters\" to\ndrown mankind (Met. 1.253–312). Virgil's Neptune at the fall of Troy\n\"strikes the wall; his trident vast makes her foundation tremble\"\n(Aen. 2.567–623) — and that wall is the one Homer's Poseidon says he\nbuilt for Laomedon and was cheated of his wage for (Il. 21.441–457). The\nLatin poet knows the Greek grudge.\n\nThe storm is the same power used two ways. Poseidon \"seizing his trident\nin his hands troubled the sea, and roused all blasts of all manner of\nwinds\" to wreck Odysseus (Od. 5.282–296). Neptune, discovering \"Saturnian\nJuno's vengeful stratagem\", rebukes the winds and calms the sea for\nAeneas (Aen. 1.124–156). Both poets keep the winds under a subordinate\nking who must answer to the lord of the sea.\n\n## Where they differ: the horses of the Consualia\n\nThe Hymn gives Poseidon \"a two-fold office … to be a tamer of horses and a\nsaviour of ships\" (HH22 4–5). Livy's Rome takes the first half and makes\na festival of it: Romulus \"made elaborate preparations for the\ncelebration of games in honour of 'Equestrian Neptune,' which he called\n'the Consualia'\", invited the neighbouring peoples, and at the signal the\nRoman youth \"dashed in all directions to carry off the maidens who were\npresent\" (Livy 1.9.6–13). The parents \"appealing to the god to whose\nsolemn games they had come\" are appealing to Neptune. That is a Roman\nstory with a Roman name — Consualia — for which no Greek text here has a\ncounterpart.\n\n## Criteria\n\n| Criterion | Poseidon | Neptune |\n|---|---|---|\n| Parentage | Cronus and Rhea (Theog. 453–458); brother of Zeus and Hades (Il. 15.187–193) | Jove's \"azure brother\" (Met. 1.253–312) |\n| Sphere | Sea and earthquake (Theog. 456; HH22); horses and ships (HH22 4–5) | Sea by fate's gift, trident (Aen. 1.124–156); earthquake (Met. 1.253–312) |\n| Chief myth (Greek) | Built Troy's wall for Laomedon, cheated of hire (Il. 21.441–457) | — |\n| Same myth (Latin) | — | Unseats Troy's wall with the trident (Aen. 2.567–623) |\n| Roman-only cult or title | — | \"Equestrian Neptune\", the Consualia (Livy 1.9.6–13) |\n| Where the names differ | \"Earth-Shaker\", \"Holder of the Earth\" (Theog. 456; HH22 6) | \"Ancient ruler\" of the River Gods (Met. 1.253–312) |\n\n## The rule of thumb\n\nWherever there is a trident, Neptune is Poseidon. Where there are games\nand horses in the valley below the Palatine, the god is Rome's.",
  "media": [],
  "x": {
    "myth": {
      "pantheon": "comparative",
      "kind": "concept",
      "domains": [
        "sea",
        "earthquakes",
        "horses"
      ]
    }
  },
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    "name": "Poseidon vs Neptune",
    "description": "Is Neptune the same as Poseidon? In myth, yes — Ovid's Neptune floods the earth with the trident and Virgil's Neptune calms the storm as the brother who won the sea by lot. In cult, no — Livy's Romans hold games for \"Equestrian Neptune\", the Consualia, at which the Sabine women are seized; no Greek text ties Poseidon to that.",
    "url": "https://mythosdata.dev/k/poseidon-vs-neptune",
    "license": "https://spdx.org/licenses/CC-BY-4.0.html",
    "dateModified": "2026-09-03",
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    "@type": "Article",
    "headline": "Poseidon vs Neptune"
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}