As the two slaves were both extremely beautiful, their respective owners decided to mate them together and share the offspring.
[3] This story is recited in one of the Kinnot for Tisha BeAv, entitled "Ve'Et Navi Hatati".
The Avot of Rabbi Natan states that he and Shimon ben Gamliel were decapitated in quick succession.
The Eleh Ezkerah is, however, known for its use of poetic license at the expense of historical accuracy, and its author(s) probably changed the narrative in order to produce a greater effect upon the mind of the reader.
[5] Ishmael's traditional tomb is located in the Druze village of Sajur in the Upper Galilee.