"Rigomagum" meaning in Latin

{
  "categories": [
    {
      "kind": "other",
      "name": "Localités de Gaule en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Mots en latin issus d’un mot en gaulois",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms propres en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Latin",
      "orig": "latin",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Toponyme latin issu dj gaulois Rigomagos, composé de rix (« roi ») et magos (« champ, marché »→ voir Rotomagus)."
  ],
  "forms": [
    {
      "form": "Rigomagī",
      "tags": [
        "singular",
        "genitive"
      ]
    },
    {
      "form": "Rigomagō",
      "tags": [
        "singular",
        "dative"
      ]
    },
    {
      "form": "Rigomagō",
      "tags": [
        "singular",
        "ablative"
      ]
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "name",
  "pos_title": "Nom propre",
  "related": [
    {
      "word": "Rigomagus"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en latin",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Remagen, ville sur le Rhin."
      ],
      "id": "fr-Rigomagum-la-name-UqoCZPri"
    }
  ],
  "tags": [
    "neuter"
  ],
  "word": "Rigomagum"
}

{
  "categories": [
    "Localités de Gaule en latin",
    "Mots en latin issus d’un mot en gaulois",
    "Noms propres en latin",
    "latin"
  ],
  "etymology_texts": [
    "Toponyme latin issu dj gaulois Rigomagos, composé de rix (« roi ») et magos (« champ, marché »→ voir Rotomagus)."
  ],
  "forms": [
    {
      "form": "Rigomagī",
      "tags": [
        "singular",
        "genitive"
      ]
    },
    {
      "form": "Rigomagō",
      "tags": [
        "singular",
        "dative"
      ]
    },
    {
      "form": "Rigomagō",
      "tags": [
        "singular",
        "ablative"
      ]
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "name",
  "pos_title": "Nom propre",
  "related": [
    {
      "word": "Rigomagus"
    }
  ],
  "senses": [
    {
      "categories": [
        "Wiktionnaire:Exemples manquants en latin"
      ],
      "glosses": [
        "Remagen, ville sur le Rhin."
      ]
    }
  ],
  "tags": [
    "neuter"
  ],
  "word": "Rigomagum"
}