the Tribe of Manasseh: Descended from Joseph's Eldest Son Adopted by Jacob

Joseph named the firstborn Manasseh, saying, “God has made me forget all my hardship and all my father’s household.”

And now your two sons born to you in Egypt before I came to you here shall be reckoned as mine; Ephraim and Manasseh shall be mine, just as Reuben and Simeon are mine.