Born Milo, named after his parents' friend Dr. Milo, Caesar first appeared in Escape from the Planet of the Apes as the son of talking chimpanzees Cornelius and Zira after they travelled back in time the Earth of Taylor's era. As the infant was feared to be the cause of the future where his parents originated, Milo was raised by circus owner Armando after Zira switched him with a young chimpanzee recently born to Armando's primitive chimpanzee, Heloise, prior to his parents' death by the action of the human Dr. Otto Hasslein. As Hasslein killed the infant with Zira deposing of the body, Milo was assumed dead and was raised by Armando as a mute acrobat while renamed ''Caesar''.

Can we conclude that is caesar in the old planet of the apes?
yes