In the thirty and first year of Asa king of Judah began Omri to reign over Israel, twelve years: six years reigned he in Tirzah. 1 Kings 16:23
"In 1868 researchers excavated a large stone slab, dated to about 9th
century BC, called the Mesha Stele (or the Moabite Stone). 
A year
later it was damaged, making part of it unreadable.
But before the
damage was done, a paper-mache impression (called a “page squeeze”) was
completed, giving us an impression of the original words.
This stele is significant in that it
references the personal name of the God of the Bible (Yahweh) and
describes Moab’s subjection under Omri, one of the kings of Israel. But,
even more excitingly, it’s been long thought that this slab also
contains an extrabiblical reference to the “House of David,” though, due
to an unreadable letter, this interpretation has always been debated." AIG