'King of Israel' in the Bible

Then David returned to bless his household. But [his wife] Michal the daughter of Saul came out to meet David and said, “How glorious and distinguished was the king of Israel today, who uncovered himself and stripped [off his kingly robes] in the eyes of his servants’ maids like one of the riffraff who shamelessly uncovers 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.