Millo

Millo (meaning fullness, likely referring to a filled-in terrace or earthwork) was a structural feature of ancient Jerusalem, associated with the defense and expansion of the city at several periods. David built from the Millo inward after capturing Jerusalem from the Jebusites (2 Samuel 5:9), indicating it was a pre-Israelite fortification feature at the north of the original City of David. Solomon later built up the Millo as part of his extensive building program, filling in the Kidron valley slope with terraces to support expanded construction (1 Kings 9:15, 24; 11:27).

Joash was assassinated at the house of Millo on the way that goes down to Silla (2 Kings 12:20). Hezekiah later repaired and strengthened the Millo as part of Jerusalem's defenses against Sennacherib (2 Chronicles 32:5). Archaeological excavations in the City of David have identified a massive stepped stone structure that many scholars identify as the Millo.