The plural possessive form of "patriarch" is "patriarchs'".
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There are patriarchs in the Catholic Church, usually called
archbishops. They are found primarily in some of the eastern rites
of Catholicism. The Orthodox Church also has patriarchs.
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Cave of the Patriarchs massacre happened on 1994-02-25.
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The cast of The Patriarchs - 2009 includes: Charles Lum as
Pausanius