'King of Israel' in the Bible

Then David returned to bless his household. And Michal the daughter of Saul came out to meet David, and said, How glorious was the king of Israel to day, who uncovered himself to day in the eyes of the handmaids of his servants, as one of the vain fellows shamelessly uncovereth himself!

Then Nathan said to David, “You are the man! Thus says the Lord, the God of Israel, ‘I anointed you as king over Israel, and I spared you from the hand of Saul.