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The Talmud does not consider Jacob's "other" two wives, Zilpah and Bilhah, to be "matriarchs": תָּנוּ רַבָּנַן: אֵין קוֹרִין ״אָבוֹת״ אֶלָּא לִשְׁלֹשָׁה, וְאֵין קוֹרִין ״אִמָּהוֹת״ אֶלָּא לְאַרְבַּע. -- The Sages taught in a baraita: One may only call three people patriarchs, [Abraham, Isaac, an...