Buster Keaton was best known for his silent films, in which his trademark was physical comedy with a consistently stoic,  expression which earned him the nickname “The Great Stone Face

He starred in and directed the 1926 action ‘The General’

Charlie Chaplin was a prominent slapstick comedy star from 1914 onwards.
Perhaps most notably, Chaplin starred in and directed ‘The Kid’ in 1921

Harold Lloyd was one of the most popular and influential film comedians of the silent film era. He was most-known for his famous ‘glass’ character, in tune with 1920s-era United States. He starred in ‘Safety Last!’ in 1923 directed by Fred C. Newmeyer and Sam Taylor

Their films could become global, since they were silent so aspects could be adapted and inspired from the work of the three stars

The Italian equivalent to Chaplin was called Toto

Jacques Tati was considered the French equivalent to Chaplin due to the similarities in slapstick, silent acting