In "The House of Hades," Percy Jackson reveals his loyalty to both Greek and Roman traditions through his distinctive brand from Camp Jupiter. This SPQR mark, coupled with Neptune's trident, symbolizes the blend of these two rich mythological heritages. Percy's confidence in this fusion is conveyed clearly when he states that combining Greek and Roman cultures leads to powerful results.

His declaration is not just theoretical; it prompts a physical reaction from the empousai, creatures of myth, who retreat in fear. This moment showcases Percy's protective instincts and strength, emphasizing how the melding of cultures enhances his abilities as a hero. The scene highlights the ongoing conflict and challenges the characters face as they navigate their dual identities.