Smith's Bible Dictionary
Absalom's Pillar. A monument of tomb which Absalom had built during his lifetime in the king's dale, that is, the valley of the Kedron, at the foot of Mount Olivet, near Jerusalem, 2 Samuel 18:18, compare with 2 Samuel 14:27. For his three sons, and where he probably expected to be buried. The tomb there now, and called by Absalom's name was probably built at a later date.
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Smith, William, Dr. Entry for 'Absalom's Pillar'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/a/absaloms-pillar.html. 1901.