"I'm the son of Jupiter! I'm a child of Rome, consul to demigods, praetor of the First Legion. I slew the Trojan sea monster, I toppled the black throne of Kronos and and destroyed the Titan Krios with my own hands. And now I'm going to destroy you, Porphyrion, and feed you to your own wolves."
~ Jason Grace

Jason Grace is the demigod son of Jupiter (Roman God of the Sky) and the late actress Beryl Grace, the younger brother of Thalia Grace (whom Beryl had with Jupiter's Greek form Zeus), the former co-praetor of Camp Jupiter, the Counsellor of Cabin 1 at Camp Half-Blood, the boyfriend of Piper McLean and one of the protagonists of the 2010-2014 Greco-Roman mythology book series The Heroes of Olympus (the sequel series to the 2005-2009 Greek mythology book series Percy Jackson and the Olympians).


Jason was born to Jupiter and Beryl 7 years after the birth of his sister Thalia, whom Beryl had with Jupiter's Greek form Zeus. Jupiter's wife Juno was angered at her husband's infidelity, but Jupiter was able to appease her by naming his son after the Argonaut Jason, who was Juno's favourite hero, and made her Jason's patron. After staying for some time, Jupiter left the Grace family to return to his godly duties as he had done previously as Zeus (and also because Beryl kept wanting him to make her immortal, eternally beautiful and to take her to Olympus). Afterwards, Beryl became unstable, causing Thalia (who wished to leave home) to stay to care for Jason as she didn't trust her mother to look after him properly.

Two years later, Beryl took Jason and Thalia on vacation to Sonoma Valley where she told Thalia to get the picnic basket from the car. However whilst Thalia was away, Beryl gave Jason to Juno as a peace offering, before telling Thalia, after she returned, that Jason was dead. Juno then took Jason to The Wolf House (where Roman demigods begin their training) and gave him to a wolf named Lupa (who was also the same wolf who raised Romulus and Remus), who trained him to be a demigod. After Jason completed his training, Lupa sent him to Camp Jupiter (a training camp for Roman demigods) in San Fransisco, where he eventually became the camp's co-praetor alongside Reyna Ramírez-Arellano. Whilst Jason was at Camp Jupiter, he was unaware of Thaila leaving home (after falling out with Beryl over his supposed death) and his mother's death by drink driving.

When Titans attacked America, Jason led an army from Camp Jupiter to attack the Titans' base on Mount Othrys where Jason defeated a Titan named Krios with his bare hands before toppling the Titans' leader Kronos' throne. Jason and his army were led to believe that Kronos disappeared after the destruction of his throne and base, unaware that he was defeated by his host Luke Castellan, during the Titans battle against the demigods of Camp Half-Blood (a training camp for Greek demigods).

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