MILLO mĭl’ ō (מִלֹּ֔וא), from מָלֵא֒, H4848, to fill, hence a mound, terrace. 1. A place, prob. a citadel, called Beth-millo (the house of Millo) (Judges 9:6, 20), located near Shechem. Its inhabitants were among those who proclaimed Abimelech king.

2. A fortification or citadel near Jerusalem, constructed by Solomon with forced labor (1 Kings 9:15, 24; 11:27). Apparently Solomon added to an existing Millo, for of David it is reported that he built the city of Jerusalem round about from the Millo inward (2 Sam 5:9; 1 Chron 11:8). The Millo formed a prominent part of the works of defense set up by King Hezekiah for the protection of the city (2 Chron 32:5). The “house of Millo” where Joash was slain (2 Kings 12:20) was prob. this Millo. The exact location of this fortification remains uncertain.

Bibliography J. Simons, Jerusalem in the Old Testament (1952), 131-144.