heptarch

/ˈhɛpˌtɑːrk/
noun
  1. A ruler of one of seven kingdoms in a heptarchy, especially in early Anglo-Saxon England.
    • Each heptarch governed his own territory with little interference from the others.
    • Historians debate how much power a typical heptarch actually held.
    • The heptarchs of Anglo-Saxon England often fought over land and resources.
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