heptarchal

• a word derived from heptarchy.
  heptarchy

  noun

  the seven principal concurrent Anglo-Saxon kingdoms supposed to have existed in the 7th and 8th centuries.

More Suggestions

• heptagonal
• Petrarchan
• heptachlor
• heptachord
• metarchon
• monarchal
• pentarchy
• septarian
• Plutarchian