Jacob had twelve sons while living in northern Syria. His firstborn Reuben was the son of Leah, who later gave birth to Simeon, Levi, Judah, Issachar, and Zebulun. Leah's servant Zilpah had two sons: Gad and Asher.Jacob and his wife Rachel had Joseph and Benjamin. Rachel's servant woman Bilhah had two more sons: Dan and Naphtali.