Jewish patriarch. The only son of Abraham and Sarah, the father of Esau and Jacob, who was renamed Israel. Isaac was not Abraham's firstborn, or only, son. Fourteen years earlier, Sarah (then called Sarai) had arranged for a child to be born to Abraham through her own Egyptian maidservant, Hagar, from whom Ishmael was born. Abraham's covenant with God was affirmed through his readiness to sacrifice his son Isaac on the altar at Mount Moriah on what is today known as the Temple Mount.
Historical Dictionary of Israel. Bernard Reich David H. Goldberg. Edited by Jon Woronoff..