2 Samuel 18:17-18

17They took Absalom, threw him into a large pit in the forest, and raised up a huge mound of stones over him. And all Israel fled, each to his tent.

18When he was alive, Absalom had taken a pillar and raised it up for himself in the King’s Valley, since he thought, “I have no son to preserve the memory of my name.” So he named the pillar after himself. It is still called Absalom’s Monument today.