The Heroes of Olympus
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50 free The Heroes of Olympus trivia questions with answers — literature quiz, new questions added Oct 2026.
The Heroes of Olympus picks up where Percy Jackson's first adventures left off and makes his world twice as big. Rick Riordan adds a hidden Roman camp, a fresh cast of demigods who share the storytelling, and an enemy older than the gods themselves: Gaea, the earth, who is slowly waking up. This quiz covers the whole series, from Jason, Piper and Leo's opening quest to the final stand against the giants. Expect questions on the seven demigods of the prophecy and their powers, their godly parents and rivals, Camp Half-Blood and Camp Jupiter, the monsters and immortals they meet along the way, and a little about how the books came to be written. It is pitched at readers who have finished the series, with plenty that casual fans can reason out from the myths. Every answer comes with a short explanation, so you can play straight through or print the questions for a book club, a classroom or a long car journey.
30 of 50 questions with answers and explanations. Play the quiz
Q 01What name does Leo Valdez give the flying warship he builds to carry the Heroes of Olympus to Greece?
Argo II
Argo II is a flying trireme that Leo designed partly from a picture he drew in kindergarten. A bronze dragon's head serves as its figurehead.
Q 02Which goddess steals the memories of Percy Jackson and Jason Grace and swaps them between two rival demigod camps?
Hera
Hera, acting in her Roman form as Juno, made the swap to force Greek and Roman demigods to unite. She had earlier posed as Leo's babysitter, Tía Callida.
Q 03Reyna's older sister Hylla rules as queen of which all-female group in The Heroes of Olympus?
The Amazons
The Amazons secretly run the billion-dollar Amazon.com as both a cover story and a money-maker, with Hylla on the throne.
Q 04In The Lost Hero, the last demigod before Leo Valdez able to summon flames is blamed for which disaster?
The Great Fire of London
The Great Fire of London is pinned in the book on Thomas Faynor, a demigod who could not control his flames. Campers call the gift a curse.
Q 05Piper McLean's dagger Katoptris, which shows her visions of the future, once belonged to which legendary beauty?
Helen of Troy
Helen of Troy once owned Katoptris, whose name is ancient Greek for mirror. The blade stops showing visions after the last battle against the giants.
Q 06Camp Jupiter's legion keeps a war elephant named after which ancient general who fought Rome?
Hannibal
Hannibal is the war elephant owned by Camp Jupiter, a cheeky choice for Romans: the real Hannibal of Carthage was one of Rome's most feared enemies.
Q 07Which son of Hades, half-brother of Hazel Levesque, was the only demigod who knew about both camps before the war?
Nico di Angelo
Nico di Angelo was born in Italy before the Second World War and looks only fourteen because the Lotus Hotel and Casino kept him outside time for decades.
Q 08Leo Valdez swears on the River Styx to return to the island of Ogygia and free which captive he loves?
Calypso
Calypso, a daughter of the Titan Atlas, had been confined to Ogygia since the First Titan War. Leo keeps his oath and frees her at the end of the series.
Q 09Stheno and Euryale, who chase an amnesiac Percy Jackson all the way to Camp Jupiter, are sisters of which monster?
Medusa
Medusa lost her head to Percy in The Lightning Thief. Her sisters are among the monsters brought back to life when the Doors of Death opened.
Q 10Which hero, posted by Zeus at the entrance to the Mediterranean, demands a quest from Jason Grace and Piper McLean?
Hercules
Hercules guards the pillars that bear his name and sends the pair to steal the river god Achelous's remaining horn, which Piper keeps for herself.
Q 11Leo Valdez's rare gift for conjuring fire out of nothing comes from which immortal father?
Hephaestus
Hephaestus rarely passes on the fire gift, and Leo hides it at first out of guilt over his mother's death seven years earlier.
Q 12Piper McLean, who cuts her own hair and cares little for fashion, is claimed by which goddess in The Lost Hero?
Aphrodite
Aphrodite's children are usually obsessed with beauty and fashion, which Piper is not. Her inherited powers include speaking French, the language of love.
Q 13Jason Grace wakes with no memory on a Wilderness School bus heading for a field trip to which landmark?
The Grand Canyon
The Grand Canyon is where a classmate turns into a storm spirit and attacks, moments before a flying chariot arrives from Camp Half-Blood.
Q 21Which Heroes of Olympus novel follows an amnesiac Percy Jackson as he befriends Hazel Levesque and Frank Zhang?
The Son of Neptune
The Son of Neptune is how a goddess introduces Percy to the Roman legion when he arrives, using his father's Roman name rather than the Greek Poseidon.
Q 22Percy Jackson, Hazel Levesque and Frank Zhang travel to which American state to free the captive god of death?
Alaska
Alaska is where the giant Alcyoneus holds Thanatos in chains. While death is bound, Gaea's fallen allies keep returning to life.
Q 23Percy Jackson starts recovering his lost memories after a deadly wager with the blind seer Phineas by drinking what?
Gorgon's blood
Q 14Which lieutenant of the Hunters of Artemis turns out to be the long-lost older sister of Jason Grace?
Thalia
Thalia is a daughter of Zeus, the Greek form of Jason's Roman father, so the siblings belong to different camps. She had been told he was dead.
Q 15Which goddess, who raised Romulus and Remus, trains young Roman demigods before sending them to Camp Jupiter?
Lupa
Lupa is the Roman answer to Camp Half-Blood's trainer Chiron, only more militaristic. She and her pack raised Jason Grace.
Q 16Tristan McLean, the father Piper McLean rescues from a giant in The Lost Hero, is famous among mortals as what?
A film actor
A film actor of Cherokee heritage, Tristan McLean is held captive by the giant Enceladus. A potion from Piper's mother later wipes the ordeal from his mind.
Q 17Leo Valdez tames a runaway bronze dragon in the woods of Camp Half-Blood and gives it which name?
Festus
Festus, Latin for happy, later loses his body in a crash landing, but his head survives as the figurehead and control system of the demigods' ship.
Q 18Leo Valdez finds the blueprint for a flying ship in which abandoned hideout in the woods of Camp Half-Blood?
Bunker 9
Bunker 9 had been abandoned in the camp's woods. After Leo finds it, the head counselor of his cabin steps down and hands him the job.
Q 19Camp Jupiter, the hidden Roman counterpart of Camp Half-Blood, lies close to which American city?
San Francisco
San Francisco is where Jason, Piper and Leo end up late in The Lost Hero, just before Jason remembers the Roman camp he came from.
Q 20Which king of the giants, created to oppose the ruler of the gods, awakens at the climax of The Lost Hero?
Porphyrion
Porphyrion stands forty feet tall, and like every giant in the series he can only be killed by a god and a demigod fighting side by side.
Gorgon's blood begins restoring Percy's memory, while Phineas, steered by Gaea, picks the poisoned vial and dies after revealing where a giant is camped.
Q 24Jason Grace got the small scar on his upper lip as a two-year-old by trying to eat which office item?
A stapler
A stapler gave Jason the scar above his lip when he was two. His sister last saw him at that age, and their mother told her he had died.
Q 25The Fates tied Frank Zhang's life to which fragile object, meaning he dies if it ever burns away?
A piece of firewood
A piece of firewood holds Frank's life force, echoing the Greek legend of Meleager. He eventually entrusts it to Hazel for safekeeping.
Q 26Frank Zhang inherits which family gift from his distant ancestor Periclymenus, a grandson of the sea god Poseidon?
Shapeshifting
Shapeshifting runs in his mother's family, who descend from the sea god. Frank only masters it late in his first quest.
Q 27Hazel Levesque grew up in the 1940s in which American city, where her mother kept a gris-gris shop?
New Orleans
New Orleans was Hazel's home until her mother moved them far away, where Hazel died stopping a giant's rise. Decades later her half-brother led her back from the Underworld.
Q 28Which foul-mouthed horse, a half-brother of Percy Jackson, does Hazel Levesque win over with precious metals?
Arion
Arion is a son of the sea god and the grain goddess Ceres, and he is known to curse whenever his abilities are doubted.
Q 29Ella, who memorises books of prophecy and falls for Percy Jackson's Cyclops brother Tyson, is what kind of creature?
A harpy
A harpy with red feathers, Ella has a photographic memory, so the prophecies stored in her head make her valuable to both sides.
Q 30Which order-obsessed Roman god, whose statues line New Rome's city limits, helps Percy Jackson kill a giant?
Terminus
Terminus is the god of boundaries, and he joins the fight when Camp Jupiter is attacked because a giant only dies when a god and a demigod strike together.