Ishmael

Ishmael was the firstborn son of Abraham, born to Hagar the Egyptian maidservant of Sarah (Genesis 16). When Sarah remained barren, she offered Hagar to Abraham as a surrogate; the resulting tension led to Hagar's temporary flight to the wilderness, where an angel promised her that Ishmael would become 'a great nation' (Genesis 16:10–12). After Isaac's birth, Sarah demanded the expulsion of Hagar and Ishmael, but God affirmed that Ishmael too would father a great nation (Genesis 21:8–21). He fathered twelve princes (Genesis 25:12–18) and is regarded in Islamic tradition as a prophet and co-builder of the Kaaba with Abraham, making him a figure of immense importance across the Abrahamic faiths.