Ishmael (Jeremiah's adversary living at the time of Divided Monarchy)

Ishmael was Abraham's first son, born to Sarah's servant Hagar after Sarah, still childless, offered Hagar to Abraham as a way to fulfill God's promise of an heir on their own timetable. After Isaac was born, tension between the two half-brothers led Sarah to insist Hagar and Ishmael be sent away, and God promised Hagar that Ishmael would also become the father of a great nation, though not the covenant line. A later Ishmael, generations afterward, assassinated the Babylonian-appointed governor Gedaliah after Jerusalem's fall, triggering a fresh wave of Jewish flight into Egypt.