Which classic actor was known as the King of Hollywood in the 30s and played Rhett Butler in the 1939 movie Gone With the Wind?

Did you know Thespis, a Greek man, was the first actor in the world and he did his first act on November 23, 534 B.C.? Before that, people used to sing and dance, but they never portrayed a fictional role. It's because of Thespis that actors are also referred to as 'thespians. '