Reuben

Reuben was the firstborn son of Jacob and Leah, the founding ancestor of one of the twelve tribes of Israel (Genesis 29:32; 35:23). Though he acted to save Joseph from death when his brothers sought to kill him (Genesis 37:21–22), he forfeited his birthright primacy through the transgression of sleeping with Bilhah, his father's concubine (Genesis 35:22; 49:3–4). Jacob's deathbed blessing transferred the rights of the firstborn to Judah and Joseph, and the tribe of Reuben settled east of the Jordan River.