Planet of the Apes #1-4 take place in Ape City, where Caesars grandson, Alexander, is struggling with the burden of leadership. Simultaneously, the city itself is torn apart from within by the gorilla General Ollo, who serves as the leader of the Aldoites. That group is based on the teachings of General Aldo (from  the final film in the series, Battle for the Planet of the Apes) who believed that gorillas were the master race and that it was certainly all right for ape to kill ape... and anything else that moved.