2 Samuel 18:17-18

17They took [down the body of] Absalom and threw him into a deep pit in the forest and set up a huge mound of stones over him. Then all Israel fled, everyone to his own tent.

18Now Absalom in his lifetime had taken and set up for himself a memorial pillar which is in the King’s Valley, for he said, “I have no son to keep my name in remembrance.” He named the memorial pillar after himself, and to this day it is called Absalom’s Monument.