Throughout the Hebrew Bible, there are seven references to a location in Jerusalem known as “Millo” or the “House of Millo” (beit Millo) which appears to have predated the reign of King David. Most famously, King Joash was on his way there when he was assassinated. Nathan Steinmeyer reports on a new theory, based on the biblical, archaeological, and linguistic record, of where it might have been located:
Many options have been put forward for the location of Beit Millo and the Millo in general. One of the more common theories is that the Millo was the ancient name for the famous Stepped Stone Structure found within the modern-day City of David Archaeological Park. The new study, however, rejects this traditional identification and instead identifies the Millo with the area of Jerusalem’s Gihon Spring. . . . According to the study, the spring’s fortifications were known to the biblical writers as the Millo, and the Beit Millo was a specific and well-known building found among them.
The Hebrew word Millo comes from the verb m-l-’, meaning “to fill.” Many scholars have therefore traditionally understood the Millo to refer to a large constructional fill made of stones and earth. . . . Only twice in the Hebrew Bible, however, does the verb m-l-’ imply filling with stones and dirt. Rather, the verb is almost always used to describe filling with water, which is also how the word is regularly used in other Semitic languages. . . . The authors of the new study therefore argue that it is far more fitting for the biblical Millo to be connected with a water installation than a large constructional fill.
Read more on Bible History Daily: https://www.biblicalarchaeology.org/daily/people-cultures-in-the-bible/people-in-the-bible/king-joash-and-jerusalems-beit-millo/