The International Standard Bible Encyclopedia

Silla

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, James Orr (1915). Public domain, from the CrossWire SWORD module.