[See Twelve Tribes of Israel]
The Tribe of Simeon was a tribe descended from Simeon (son of Jacob).
In the blessing of Simeon's father, Jacob (son of Isaac), the Tribe of Simeon received a prophecy that they would be weakened and scattered, and subsequent history unfolded accordingly.
Even when Moses gave blessings before entering Canaan, there was no blessing for the Tribe of Simeon. (See Deuteronomy 33)
After the Canaanite wars, when the land was distributed, the Tribe of Simeon did not receive a separate allocation of land and had to live within the territory of Judah.
Later, during the time of King Hezekiah, only about 500 members of the Tribe of Simeon went to conquer Mount Seir and barely established a foothold there.
See also
[See Land Distribution]