An user English
says…

The
Determiner
  area
Noun
  of
Adposition
  present-day  Marumori  was
Auxiliary
  part
Noun
  of
Adposition
  ancient
Adjective
  Mutsu
Proper noun
  Province
Proper noun
.

The area of present-day Marumori was part of ancient Mutsu Province.

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