Mazar believed, as of 2007, that the Stepped Stone Structure connects with and supports the Large Stone Structure. Mazar presents evidence that the Large Stone Structure was an Israelite royal palace in continuous use from the 10th century until 586 BC. Her conclusion that the stepped stone structure and the large stone structure are parts of a single, massive royal palace makes sense of the biblical reference to the Millo as the House of Millo in and , describing it as the place where King Joash was assassinated in 799 BC while he slept in his bed. Millo is derived from "fill" (Hebrew "milui"). The stepped stone support structure is built of fills.