The Priory believes that Constantine and his male successors successfully converted the world from matriarchal paganism to patriarchal Christianity by waging a campaign of propaganda that demonized the sacred feminine, obliterating the goddess from modern religion forever.
There are no more uses of "matriarchy" in the book.
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The people of that island have a matriarchy.
It had a matriarchal twang.
Douglas Adams -- The Hitchhiker’s Guide to the Galaxy