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heretochy

ˈheretochy Obs. rare.
  [f. heretoch heretoga, after county, duchy, etc.]
  The territory ruled by a heretoga.

1577–87 Harrison England i. vii. in Holinshed 16 Kent..was made an earledome or Heretochie..Athelstone his sonne, being the first Earle or Heretoch of the same. Ibid., Northumberland..was onlie governed by earls as Here⁓toches, as an Heretochy.

Oxford English Dictionary

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