Who was often regarded as the "King of Hollywood"?

William Clark Gable (February 1, 1901 – November 16, 1960) was an American film actor. Often referred to as The King of Hollywood, he had roles in more than 60 motion pictures in a variety of genres during a career that lasted 37 years, three decades of which was as a leading man. He was named the seventh greatest male movie star of classic American cinema by the American Film Institute. Gable was one of the most consistent box-office performers in the history of Hollywood, appearing on Quigley Publishing's annual Top Ten Money Making Stars Poll sixteen times. He appeared opposite many of the most popular actresses of their time. He frequently acted alongside Joan Crawford, Myrna Loy, Jean Harlow, Lana Turner, Norma Shearer, and Ava Gardner.

Source: Wikipedia