"Brega" meaning in Middle Irish

{
  "derived": [
    {
      "_dis1": "0 0",
      "english": "Bregian; fine, excellent",
      "word": "bregda"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "mga",
        "2": "sga",
        "3": "brí",
        "t": "hill"
      },
      "expansion": "Old Irish brí (“hill”)",
      "name": "der"
    }
  ],
  "etymology_text": "From Old Irish brí (“hill”).",
  "forms": [
    {
      "form": "Breg",
      "tags": [
        "genitive"
      ]
    },
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "Brega",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    },
    {
      "form": "mBrega",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "mga",
        "2": "proper noun",
        "3": "genitive",
        "4": "Breg",
        "g": "p"
      },
      "expansion": "Brega pl (genitive Breg)",
      "name": "head"
    }
  ],
  "lang": "Middle Irish",
  "lang_code": "mga",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Middle Irish pluralia tantum",
          "parents": [
            "Pluralia tantum",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        },
        {
          "kind": "place",
          "langcode": "mga",
          "name": "Places in Ireland",
          "orig": "mga:Places in Ireland",
          "parents": [
            "Places",
            "Names",
            "All topics",
            "Proper nouns",
            "Terms by semantic function",
            "Fundamental",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Bregia (a the country around the Hill of Tara in Ireland)"
      ],
      "id": "en-Brega-mga-name-1QrEq6mE",
      "links": [
        [
          "Bregia",
          "Bregia#English"
        ],
        [
          "Tara",
          "Tara"
        ],
        [
          "Ireland",
          "Ireland#English"
        ]
      ],
      "raw_glosses": [
        "(plural only) Bregia (a the country around the Hill of Tara in Ireland)"
      ],
      "tags": [
        "plural",
        "plural-only"
      ]
    },
    {
      "glosses": [
        "inhabitants of Bregia"
      ],
      "id": "en-Brega-mga-name-x6c-IZXR",
      "tags": [
        "plural"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈbʲrʲeɣə/"
    }
  ],
  "word": "Brega"
}

{
  "categories": [
    "Middle Irish entries with incorrect language header",
    "Middle Irish lemmas",
    "Middle Irish pluralia tantum",
    "Middle Irish proper nouns",
    "Middle Irish terms derived from Old Irish",
    "Pages with 2 entries",
    "Pages with entries"
  ],
  "derived": [
    {
      "english": "Bregian; fine, excellent",
      "word": "bregda"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "mga",
        "2": "sga",
        "3": "brí",
        "t": "hill"
      },
      "expansion": "Old Irish brí (“hill”)",
      "name": "der"
    }
  ],
  "etymology_text": "From Old Irish brí (“hill”).",
  "forms": [
    {
      "form": "Breg",
      "tags": [
        "genitive"
      ]
    },
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "Brega",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    },
    {
      "form": "mBrega",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "mga",
        "2": "proper noun",
        "3": "genitive",
        "4": "Breg",
        "g": "p"
      },
      "expansion": "Brega pl (genitive Breg)",
      "name": "head"
    }
  ],
  "lang": "Middle Irish",
  "lang_code": "mga",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "Middle Irish pluralia tantum",
        "mga:Places in Ireland"
      ],
      "glosses": [
        "Bregia (a the country around the Hill of Tara in Ireland)"
      ],
      "links": [
        [
          "Bregia",
          "Bregia#English"
        ],
        [
          "Tara",
          "Tara"
        ],
        [
          "Ireland",
          "Ireland#English"
        ]
      ],
      "raw_glosses": [
        "(plural only) Bregia (a the country around the Hill of Tara in Ireland)"
      ],
      "tags": [
        "plural",
        "plural-only"
      ]
    },
    {
      "glosses": [
        "inhabitants of Bregia"
      ],
      "tags": [
        "plural"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈbʲrʲeɣə/"
    }
  ],
  "word": "Brega"
}

{
  "called_from": "inflection/865",
  "msg": "inflection table: IF WITHOUT ELSE EVALS False: Brega/Middle Irish 'radical' base_tags=set()",
  "path": [
    "Brega"
  ],
  "section": "Middle Irish",
  "subsection": "proper noun",
  "title": "Brega",
  "trace": ""
}

{
  "called_from": "inflection/735",
  "msg": "inflection table: unrecognized header: 'lenition'",
  "path": [
    "Brega"
  ],
  "section": "Middle Irish",
  "subsection": "proper noun",
  "title": "Brega",
  "trace": ""
}

{
  "called_from": "inflection/735",
  "msg": "inflection table: unrecognized header: 'nasalization'",
  "path": [
    "Brega"
  ],
  "section": "Middle Irish",
  "subsection": "proper noun",
  "title": "Brega",
  "trace": ""
}