ichor the golden fluid that is the blood of gods and immortals
Imperial gold a rare metal deadly to monsters, consecrated at the Pantheon; its existence was a closely guarded secret of the emperors
Janus Roman god of doorways, beginnings, and transitions; depicted as having two faces, because he looks to the future and to the past
Juno the Roman goddess of women, marriage, and fertility; sister and wife of Jupiter; mother of Mars. Greek form: Hera
Jupiter the Roman king of the gods; also called Jupiter Optimus Maximus (the best and the greatest). Greek form: Zeus
Kampê a monster with the upper body of a snake-haired woman and the lower body of a drakon; appointed by the Titan Kronos to guard the Cyclopes of Tartarus. Zeus slew her and freed the giants from their prison to aid him in his war against the Titans.
katobleps a cow monster whose name means “down-looker” (katoblepones, pl. ). They were accidentally imported to Venice from Africa. They eat poisonous roots that grow by the canals and have a poisonous gaze and poisonous breath.
Katoptris Piper’s dagger
Kerkopes a pair of chimpanzee-like dwarfs who steal shiny things and create chaos
Khione the Greek goddess of snow; daughter of Boreas
Koios one of the twelve Titans; Titan lord of the north
Krios one of the twelve Titans; Titan lord of the south
Kronos the youngest of the twelve Titans; the son of Ouranos and Gaea; the father of Zeus. He killed his father at his mother’s bidding. Titan lord of
fate, harvest, justice, and time. Roman form: Saturn
Labyrinth an underground maze originally built on the island of Crete by the craftsman Daedalus to hold the Minotaur (part man, part bull)
Laistrygonian giant a monstrous cannibal from the far north
Lar a house god, ancestral spirit (Lares, pl. )
legionnaire Roman soldier
lemures Roman term for angry ghosts
Leto daughter of the Titan Koios; mother of Artemis and Apollo with Zeus; goddess of motherhood
Lotus Hotel a casino in Las Vegas where Percy, Annabeth, and Grover lost valuable time during their quest after eating enchanted lotus blossoms
Mansion of Night Nyx’s palace
manticore a creature with a human head, a lion’s body, and a scorpion’s tail
Mars the Roman god of war; also called Mars Ultor. Patron of the empire; divine father of Romulus and Remus. Greek form: Ares
Medea a follower of Hecate and one of the great sorceresses of the ancient world
Mercury Roman messenger of the gods; god of trade, profit, and commerce. Greek form: Hermes
Minerva the Roman goddess of wisdom. Greek form: Athena
Minos king of Crete; son of Zeus; every year he made King Aegus pick seven boys and seven girls to be sent to the Labyrinth, where they would be eaten by the Minotaur. After his death he became a judge in the Underworld.
Minotaur a monster with the head of a bull on the body of a man
Mist a magic force that disguises things from mortals
Mount Tamalpais the site in the Bay Area (Northern California) where the Titans built a palace
naiads water nymphs
Necromanteion the Oracle of Death, or House of Hades in Greek; a multileveled temple where people went to consult with the dead
Neptune the Roman god of the sea. Greek form: Poseidon
New Rome a community near Camp Jupiter where demigods can live together in peace, without interference from mortals or monsters
Notus Greek god of the South Wind. Roman form: Auster
numina montanum Roman mountain god (montana, pl). Greek form: ourae
nymph a female nature deity who animates nature
nymphaeum a shrine to nymphs
Nyx goddess of night; one of the ancient, firstborn elemental gods
Odysseus legendary Greek king of Ithaca and the hero of Homer’s epic poem The Odyssey. Roman form: Ulysses
Ogygia the island home—and prison—of the nymph Calypso
ourae Greek for mountain god. Roman form: numina montanum
Ouranos father of the Titans
Pasiphaë the wife of Minos, cursed to fall in love with his prize bull and give birth to the Minotaur (part man, part bull); mistress of magical herbal arts
Pegasus in Greek mythology, a winged divine horse; sired by Poseidon, in his role as horse-god, and foaled by the Gorgon Medusa; the brother of Chrysaor
Periclymenus an Argonaut, the son of two demigods, and the grandson of Poseidon, who granted him the ability to change into various animals
peristyle entrance to an emperor’s private residence
Persephone the Greek queen of the Underworld; wife of Hades; daughter of Zeus and Demeter. Roman form: Proserpine
phalanx a compact body of heavily armed troops
Phlegethon the River of Fire that flows from Hades’s realm down into Tartarus; it keeps the wicked alive so they can endure the torments of the Fields of Punishment
pilum (pila, pl. ) a javelin used by the Roman army
Pluto the Roman god of death and riches. Greek form: Hades
Polybotes the giant son of Gaea, the Earth Mother
Polyphemus the gigantic one-eyed son of Poseidon and Thoosa; one of the Cyclopes
Porphyrion the king of the giants in Greek and Roman mythology
Poseidon the Greek god of the sea; son of the Titans Kronos and Rhea, and brother of Zeus and Hades. Roman form: Neptune
praetor an elected Roman magistrate and commander of the army