Greek mythology to dominance is frequently called the "Dorian invasion". The Lydian and later the Macedonian kings, as rulers of the same rank, also became Heracleidae. Other members of this earliest generation of heroes such as Perseus, Deucalion, Theseus and Bellerophon, have many traits in common with Heracles. Like him, their exploits are solitary, fantastic and border on fairy tale, as they slay monsters such as the Chimera and Medusa. Bellerophon's adventures are commonplace types, similar to the adventures of Heracles and Theseus. Sending a hero to his presumed death is also a recurrent theme of this early heroic tradition, used in
The Lost Hero hero from a Roman counterpart camp to Camp Half-Blood called Camp Jupiter somewhere near San Francisco, California. Hera, known as Juno to the Romans, has switched him with the Greek hero Percy Jackson, who is now at the Roman camp with no memory of his previous life. Camp Half-Blood and Camp Jupiter always had a ruthless rivalry; whenever they came into contact, things never ended well. After realizing how many Greek and Roman myths he had left untouched as well the immense success of the original series, Riordan began writing a second series, using inspiration for his storyline from experiences