The Kings are a gang of greasers the control the area of New Vegas known as Freeside. They came to Freeside after being ran out of The Strip by House and discovering The King's School of Impersonation. They are led by a man who, ironically enough, calls himself the King. When they found The King's School of Impersonation they believed it was sort of a place of worship to a man. That man was Elvis Presley.