1 Kings 16:23-24

23Omri became king of Israel when Asa had been king of Judah for 31 years. Omri ruled Israel as king for 12 years. He lived in Tirzah for the first six years.

24Then Omri bought a hill from a man called Shemer. He paid Shemer 70 kilograms of silver for it. He built a city on the hill and he called the city Samaria. That was because the hill had belonged to Shemer.