The Patriarchs, known as the Avot in Hebrew, are Abraham, his son Isaac and his grandson Jacob. Collectively, they are referred to as the three patriarchs (sh'loshet ha-avot) of Judaism, and the period in which they lived is known as the patriarchal period. Their primary wives – Sarah (wife of Abraham), Rebeccah (wife of Isaac), and Leah and Rachel (the wives of Jacob) – are known as the Matriarchs. Thus, classical Judaism considers itself to have three patriarchs and four matriarchs.