Who was the actor that played the lead in the first Tarzan movie?

Tarzan of the Apes is a 1918 American action/adventure silent film directed by Scott Sidney starring Elmo Lincoln, Enid Markey, George B. French and Gordon Griffith. It was the first film adaptation of Edgar Rice Burroughs' original novel, which is widely considered to be the faithful to the literary work. Only the first part of the novel was adapted, and the second part later became the basis for the sequel, The Romance of Tarzan.