The Hollywood Reporter has brief synopsis:
Many apes societies have grown from when the Moses-like Caesar brought his people to an oasis, while humans have been reduced to a feral-like existence. Some groups have never heard of Caesar, while others have contorted his teaching to build burgeoning empires. In this setting, one ape leader begins to enslave other groups to find human technology, while another ape, who watched his clan be taken, embarks on a journey to find freedom. A young human woman becomes key to latter’s quest, although she has plans of her own.
So societies will be looking at and treating Caesar like an ape Jesus.