1. The goddesses of destiny, represented as the three sisters Urd (or Wyrd), Verdandi (or Verthandi), and Skuld. The counterparts of the Greek Fates, they tend the Well of Fate at the roots of Yggdrasil.

2. One of the offspring of Typhon and Echidna. The Hydra was a multi-headed water serpent that breathed poisonous gas and had toxic blood, and every time one head was cut off, two more grew back in its place. The Hydra dwelled in the Spring of Amymone in the swamp or lake of Lerna near the Peloponnese, beneath which was said to be an entrance to the Underworld. The Hydra was killed by Heracles as his second labor for Eurystheus during a battle in which Heracles' nephew Iolaus provided aid by cauterizing the neck stumps after Heracles cut each head off, preventing additional heads from growing back. After killing the monster, Heracles dipped his arrows in the Hydra's blood; the poisoned arrows were later used against the Stymphalian Birds, Geryon, and the centaur Nessus.

3. The wife of Hector and mother of Astyanax, she futilely warns Hector about the war, then sees both her husband and son killed by the Greeks. After the war she is made concubine to Neoptolemus, and later marries the Trojan prophet Helenus.

4. Yet another son of Priam and Hecuba, this priest of Apollo shares Cassandra's doubt about the merits of bringing the Trojan horse into the city. 'Timeo danaos et dona ferentes,' he says (according to Vergil), 'I fear the Greeks, even bearing gifts.' Later, while sacrificing a bull, two serpents from the sea crush both him and his two young sons. The death of Laocoon is often blamed on Athena (into whose temple the serpent disappeared) but more likely the act of Poseidon, a fierce Greek partisan.

5. Termed the 'lady of the castle,' for her role as guardian of tombs, she sided against her own husband, Set, in his battle against Osiris, but when Set was destroyed, she collected the bits of his body and brought him back to life, much as Isis had done for Osiris. In addition to being Isis' sister, she was also said to be Osiris' mistress, leading to much complaint from Isis. Due to her close ties to all the other gods, she was rarely associated with a cult of her own.

6. The only mortal member of the Gorgons, a trio of monstrous daughters of Phorcys and Ceto who had brass hands, fangs, and venomous snakes for hair; the other two were Stheno and Euryale. Many early sources state that Medusa was born a monster, though Ovid's Metamorphoses state that Medusa was a beautiful woman until she was raped by Poseidon in Athena's temple and cursed by the goddess. Gazing directly into Medusa's eyes resulted in the onlooker being turned into stone. She was beheaded by the hero Perseus, who was sent to retrieve her head by the tyrant Polydectes, whom Perseus then killed with the head. Perseus gave the head of Medusa to Athena, who placed it on her shield, the aegis. When Medusa was beheaded, the winged horse Pegasus and the giant warrior Chrysaor emerged, her sons by Poseidon. According to Ovid, Medusa's head was also used to petrify the Titan Atlas.

7. The king of Mycenae, Agamemnon shares supreme command of the Greek troops with his brother, Menelaus. An epithet of his, 'king of heroes,' reflects this status. As a commander, however, he often lacks good public relations skills, as shown by his feud with Achilles and by his ill-considered strategy of suggesting that all the troops go home. Upon his return home, Agamemnon is murdered by his wife, Clytemnestra, and her lover, Aegisthus.

8. A character who goes by many other names, among them Nimue and Vivien. In many stories, the Lady of the Lake is responsible for bestowing Excalibur upon King Arthur. She also gave Merlin his powers of sorcery and raised Sir Lancelot after his father's death. The Lady of the Lake is frequently associated with the isle of Avalon and is sometimes conflated with Morgan le Fay.

9. The king of Sparta, Menelaus is the husband of Helen, the cause celebre of the war. He tries to win Helen back by fighting Paris in single combat, but Aphrodite carried Paris off when it seemed that Menelaus would win. Despite his notionally equal say in commanding the troops with his brother Agamemnon, in practice Agamemnon often dominates.

10. Personification of the midday sun, he was also venerated as Atum (setting sun) and Khepri (rising sun), which were later combined with him. He traveled across the sky each day and then each night, the monster Apep would attempt to prevent his return. Other myths held that Ra spent the night in the underworld consoling the dead. The god of the pharaohs, from the fourth dynasty onward all pharaohs termed themselves 'sons of Ra,' and after death they joined his entourage. He was portrayed with the head of a falcon, and crowned with the sun disk.

11. The god of the sky and light and the son of Isis and Osiris. In earlier myth he was the brother of Set, and son of Ra. His mother impregnated herself by the dead Osiris, then hid Horus. When he was grown, he avenged his father's death, driving away Set. In the battle, he lost his eye, but regained it thanks to the god Thoth. Thus Horus came to rule over the earth. He was known to have two faces, that of the falcon, Harsiesis, and that of a child, Harpocrates.

12. Considered the most beautiful mortal woman during the Age of Heroes. Helen was the daughter of Zeus and Leda, and her siblings were Castor, Polydeuces (or Pollux), and Clytemnestra. When Helen married Menelaus, the king of Sparta, Helen's father Tyndareus forced the Greek kings to swear an oath to fight for her if she were kidnapped. When she was abducted by (or eloped with) Paris, a prince of Troy, the whole Greek world plunged into the Trojan War. For this reason, Christopher Marlowe had Doctor Faustus refer to Helen as 'the face that launched a thousand ships.'

13. A hybrid monster who was also a child of Typhon and Echidna. She is most commonly described as a lioness with a goat's head protruding from her back and a tail that ended in a snake's head. She was a fire-breathing menace to Lycia until Bellerophon slew her on orders from King Iobates. Flying on the back of Pegasus, Bellerophon shot at the Chimera and ultimately killed the beast by affixing a block of lead to his spear and causing the Chimera to melt the block with her fiery breath, suffocating her in the process.

14. The three-headed (or, according to Hesiod's Theogony, fifty-headed) dog who guarded the gates to the Underworld. A child of Typhon and Echidna, Cerberus is described as a hellhound with a mane of snakes, the claws of a lion, and the tail of a deadly snake. As Heracles' twelfth and final labor, he had to bring Cerberus back from the Underworld, which he did following an intense wrestling match. Prior to the task, Heracles was instructed in the Eleusinian Mysteries, and freed Theseus from being stuck on a chair in Hades. In Virgil's Aeneid, the Cumaean Sibyl gives Cerberus three drugged honey cakes so that she and Aeneas can enter the Underworld.

15. Also the son of Priam and Hecuba, he is destined to be the ruin of his country. He fulfills this destiny by accepting a bribe when asked to judge which of three goddesses is the fairest. When he awards Aphrodite the golden apple, Aphrodite repays him by granting him the most beautiful woman in the world; unfortunately, Helen is already married to Menelaus. Known less for hand-to-hand fighting than for mastery of his bow, he kills Achilles with an arrow but dies by the poisoned arrows of Philoctetes.

16. 'The Once and Future King' was the son of Uther Pendragon and Lady Igraine. Uther disguised himself as Igraine's husband Gorlois to sleep with her. Arthur wields the legendary sword Excalibur and rules the Britons from the castle of Camelot beside his wife, Queen Guinevere. The stories of Arthur and his Knights of the Round Table are recounted by Geoffrey of Monmouth in Historia Regum Britanniae, works by Chrétien de Troyes, and Thomas Mallory's Le Morte d'Arthur, among others. The different sources disagree on various details; for instance, some sources state that Arthur received Excalibur from the Lady of the Lake, while in others he pulls the sword from a stone. After the Battle of Camlann, King Arthur gives Excalibur to his marshal, Sir Bedivere, and is taken to the isle of Avalon to die.

17. A Knight of the Round Table and the son of Morgause and King Lot of Orkney, making him the nephew of King Arthur. He is the hero of the Pearl Poet's 14th-century romantic epic Sir Gawain and the Green Knight, in which Gawain's loyalty and resolve are tested by the title Green Knight (secretly Lord Bertilak), who survives his beheading at the hands of Gawain and returns a year later to return the favor. Gawain's brothers Gareth and Gaheris are killed during Lancelot's rescue of Queen Guinevere, sending Gawain into a frenzy.

18. This son of Laertes is known for his cleverness and glib tongue. His accomplishments include a successful night raid against King Rhesus, winning the armor of Achilles, and engineering the famous Trojan Horse. His ten-year trip home to Ithaca (where his wife, Penelope, awaits) is the subject of the Odyssey.

19. The daughter of Ra, she predated the universe and served over the creation of it, ensuring balance between everything. Primarily seen as the keeper of order, Ma'at was responsible for seasons, day and night, rainfall, and star movements. A symbolic offering of Ma'at, in the form of a statuette was given to the gods, as Ma'at encompassed all other offerings. Ma'at's aspect as god of justice also showed through her role in death ritual, where her ostrich feather was weighed against the hearts of the dead in the underworld. Judges wore effigies of Ma'at, and the supreme head of courts was said to be the priest of Ma'at.

20. A sorceress from the island of Colchis; her father was King Aeëtes, and her aunt was the witch Circe. Medea encountered the hero Jason when he and the Argonauts came to Colchis in search of the Golden Fleece, and she helped him yoke fire-breathing oxen and sow dragon's teeth. Medea left Colchis with Jason, and on the voyage home she killed both her brother Absyrtus and the giant bronze automaton Talos. She and Jason had several children together, but Jason ultimately left Medea for the princess Glauce; in vengeance, she killed two of her children and fled on a golden chariot.

21. A primordial giant who formed in the void Ginnungagap from fire and ice. He gave birth to the frost giants and created the primordial cow Audhumla. He was killed by Odin and his brothers, who used his body to construct most of the universe.

22. A monstrous beast sent by Artemis to wreak havoc in Calydon after King Oeneus neglected to honor her while sacrificing to the gods. Oeneus's son Meleager led a group of heroes — including Theseus, the twins Castor and Polydeuces (or Pollux), and Achilles's father Peleus, as well as the huntress Atalanta — on what became known as the Calydonian Boar Hunt. Atalanta drew first blood, and Meleager finished off the beast. Meleager, who had fallen in love with Atalanta, then insisted on honoring her by giving her the hide. Meleager's uncles protested, Meleager killed them, and Meleager's mother avenged the death of her brothers by burning up the log that represented Meleager's lifespan, killing him.

23. A Knight of the Round Table renowned for his purity and honor. Galahad is the illegitimate son of Sir Lancelot and King Pelles's daughter Lady Elaine of Corbenic. Sir Galahad is the only member of Arthur's corps who can sit in the Siege Perilous, a seat at the Round Table set aside by Merlin for the knight who would complete the quest for the Holy Grail. Galahad's quest for the Holy Grail, which he completed alongside Sir Percival and Sir Bors, ended when he encountered the Fisher King, who asked him to take the chalice to Sarras. Galahad is supposedly descended from the brother-in-law of Joseph of Arimathea, who later visits him and allows him to ascend to Heaven.

24. Serving the gods as the supreme scribe, the ibis-headed Thoth was known as the 'tongue of Ptah' for his knowledge of hieroglyphics, and as the 'Heart of Re' for his creative powers. His knowledge of science and calculation made him the creator of the calendar, and his symbol was the moon due to his knowledge of how to calculate its path. His knowledge of magic led to his association with the Greek Hermes. Thoth was consulted by Isis when attempting to resurrect Osiris, and was again consulted when the young Horus was stung by a scorpion.

25. A fierce warrior who drew first blood in the Calydonian Boar hunt led by Meleager, who gifted her the Boar's hide when it was finally killed. Atalanta's father left her to die on a mountaintop because he wanted a son, but she was saved by a she-bear and later became a hunter of Artemis. According to some sources, Atalanta was also the only female Argonaut. She married Hippomenes after he beat her in a footrace by slowing her down with golden apples given to him by Aphrodite; their son, Parthenopaios, was one of the Seven Against Thebes.