"emperere" meaning in Ancien français

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes de noms communs en ancien français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Ancien français",
      "orig": "ancien français",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "notes": [
    "Dans son édition critique de la Chanson de Roland, Léon Gautier parle de la variante empereres ici."
  ],
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "related": [
    {
      "word": "empereres"
    }
  ],
  "senses": [
    {
      "form_of": [
        {
          "word": "empereur"
        }
      ],
      "glosses": [
        "Cas sujet singulier de empereur."
      ],
      "id": "fr-emperere-fro-noun-TV7GYCj1"
    }
  ],
  "tags": [
    "form-of",
    "masculine"
  ],
  "word": "emperere"
}

{
  "categories": [
    "Formes de noms communs en ancien français",
    "ancien français"
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "notes": [
    "Dans son édition critique de la Chanson de Roland, Léon Gautier parle de la variante empereres ici."
  ],
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "related": [
    {
      "word": "empereres"
    }
  ],
  "senses": [
    {
      "form_of": [
        {
          "word": "empereur"
        }
      ],
      "glosses": [
        "Cas sujet singulier de empereur."
      ]
    }
  ],
  "tags": [
    "form-of",
    "masculine"
  ],
  "word": "emperere"
}