Why did Absalom erect a monument in his honor?

ANSWER

He had no son to carry on his name.

2nd Samuel 18 :

18 During his lifetime Absalom had taken a pillar and erected it in the King’s Valley as a monument to himself, for he thought, “I have no son to carry on the memory of my name.” He named the pillar after himself, and it is called Absalom’s Monument to this day.
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