sil'-a (cilla'; Codex Vaticanus Galla; Codex Alexandrinus Gaallad): Joash was assassinated by his servants "at the house of Millo, on the way that goeth down to Silla" (2Ki 12:20). Wherever Beth-millo stood, Silla was evidently in the valley below it; but nothing is known of what it was or where it stood.
The International Standard Bible Encyclopedia
Silla
The International Standard Bible Encyclopedia, James Orr (1915). Public domain, from the CrossWire SWORD module.