Marvel Comics artist Jack Kirby was known by which nickname?

Jack Kirby (August 28, 1917 – February 6, 1994) was an American comic book artist, writer, and editor, widely regarded as one of the medium's major innovators and one of its most prolific and influential creators. Kirby was married to Rosalind Goldstein in 1942. They had four children and remained married until his death from heart failure in 1994, at the age of 76. The Jack Kirby Awards and Jack Kirby Hall of Fame were named in his honor, and he is known as "The King" among comics fans for his many influential contributions to the medium.