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In page List of female hereditary monarchs:

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  • Irmgard of Wevelinghoven (d. 1474), Heiress of Lordship of Alfter
  • Isabeau of Antoing (d. 1354), Burgravine of Ghent[citation needed]
  • Isabeau of Carlat, Viscountess of Carlat, 1303–?