Important Dates

This page contains important dates or occurrences during the events of Percy Jackson and the Olympians and The Heroes of Olympus series. If an exact date is unknown, you can add just the year to the month it takes place in. Please do not add an event that does not relate to the Percy Jackson or the Heroes of Olympus series (such as the birthdays of the actors/actresses) as this page is for dates taking place within the series, not in the real world.

January

 * Nico's birthday is (while undecided) Rick Riordan stated to be January 28th, 1924 (however that would make him nineteen at his mother's death not 2-4 years old).

April

 * 2010- Perseus Jackson awakes after months in deep sleep by Hera/Juno, begins training with Lupa at the Wolf House.

May

 * May 2004- Yancy Academy attends Manhattan Museum of Greek and Roman artifacts.
 * Percy destroys Alecto.

June

 * June 5, 1964 - Rick Riordan, author of the Percy Jackson & the Olympians and the Heroes of Olympus series, is born.
 * June 5, 1976 - Grover Underwood is born, the nephew of Ferdinand.
 * June 14, 2004- Perseus Jackson meets Lord Ares, God of War.
 * June 20, 2004 - Perseus Jackson, Annabeth Chase and Grover enter the Underworld and meet Hades.
 * June 21, 2004 - Perseus Jackson duels Lord Ares for the Master Bolt and for the Helm of Darkness, winning the duel.
 * June 21 - The Summer Solstice, when all the gods gather to have a meeting.
 * June 24 - The Feast of Fortuna, which determines how Camp Jupiter's luck will be the rest of the year.
 * June 24, 2010 - Perseus Jackson leads Roman army and defeats giant Polybotes. Made Preator of Camp Jupiter.
 * Late June, 2006 - A Capture the Flag game turns into a search for The Bronze Dragon.
 * June 2008- Percy carries Juno across the Little Tiber and enters Camp Jupiter.
 * 25 June 2008- Quest to stop Gaea and her Giants begins with the Seven (Jason, Percy, Piper, Leo, Hazel, Frank and Annabeth). Camp Jupiter declares war on Camp Half-Blood, causing another Civil War.

July

 * July 1 - Hera' s sacred day
 * July 1, 1992- Jason Grace is born.
 * July 1, 2008- Annabeth Chase completes the mission for the Athena Parthonese. At the same time, Percy Jackson, Jason Grace, and Piper McLean rescue Nico di Angelo and kill the Giants Ephialtes and Otis, with the help of the god Bacchus. Meanwhile, Leo Valdez, Frank Zhang, and Hazel Levesque face off the eidolons, and Leo recovers the works of Archimedes. Later, Percy, Jason, Piper, Nico, Leo, Frank, Hazel, and Gleeson Hedge rush to rescue Annabeth, just as she defeats the spider Arachne. Just as Arachne falls into Tartatus, Percy and Annabeth follow her into the deepest pit of the Underworld, sacrificing themselves to close the doors when the others reach the other side of the Doors of Death. On the last request of Jackson, Nico leads the others towards Greece, to close the Doors and rescue Jackson and Chase,
 * July 4th - Fireworks on the beach at Camp Half-Blood.

August

 * August 11, 2007 - Princess Andromeda sinks beneath the waves, along with several hundred monsters and demigods including Charles Beckendorf.
 * Percy hears the first Great Prophecy.
 * August 17, 2007- The Battle of Manhattan begins.
 * Micheal Yew goes M.I.A
 * The city of Manhattan falls asleep due to the Morpheus Enchantment.
 * Silena Beauregard is killed by the Lydian drakon.
 * Clarisse La Rue achieves the blessing of Ares.
 * August 18,1991 - Perseus "Percy" Jackson is born to Sally Jackson and Poseidon.
 * August 18, 2007 - The Second Olympian War ends.
 * Titan Army loses the Second Olympian War.
 * Kronos' scythe, a.k.a. Backbiter, is destroyed by the Olympian Goddess Hestia.
 * Ethan Nakamura betrays the Titans and becomes the last person to be killed by Lord Kronos.
 * Titan Lord Kronos is scattered and will most likely never be able to reform again.
 * Luke Castellan stabs himself to destroy Lord Kronos.
 * Percy and the Greek Demigod forces successfully fend off the Titan Army from Manhattan and Mount Olympus.
 * Jason and the Roman Demigod forces destroy the Titan base at Mount Othrys, with Jason defeating Krios with his own hands.
 * Hades and his Undead Army successfully defend the Empire State Building from the remaining Titan forces.
 * Poseidon and his Aquatic Army help defeat Typhon.
 * Rachel Elizabeth Dare becomes the new Oracle after the curse is lifted by Hades.
 * Percy Jackson makes the Olympians swear on the River Styx to claim their children by the age of 13, give Hades and the minor gods thrones on Olympus cabins at Camp Half-Blood, and to never make a pact of the Big Three.
 * Percy realizes Luke was the true hero.
 * The Prophecy of Seven is revealed.
 * Percy and Annabeth started dating.

September

 * September 15, 2007
 * Aeolus orders all demigods to be killed.
 * Venti are released after the death of Typhon.
 * September 18, 2007- Percy and Annabeth's one-month anniversary
 * Percy forgets his and Annabeth's one-month anniversary.
 * The fire-breathing giant Cacus steals Hermes' caduceus.
 * Hermes seeks Percy's help to get his caduceus back.
 * In a battle against Cacus, Percy and Annabeth learn that Cacus plans to cut off communication among the Olympians, as part of Gaea's plan to overthrow the gods.
 * After destroying Cacus, Percy and Annabeth are sent to Paris for their date, as part of Percy's deal with Hermes.
 * Around this time, Zeus has been threatening to close off Mount Olympus from mortals.

October

 * October 2007- Jason Grace, a recently elected praetor, disappears from Camp Jupiter.

November

 * November 2009 - Zeus recalls all the Gods back and closes Olympus, forbidding all contact to demigods and mortals.

December

 * December 15, 2005
 * Thalia, Percy, and Annabeth meet up with Grover who has been tracking two demigods; Nico and Bianca
 * Annabeth is captured by Dr. Thorn.
 * December 13, 2007- Percy Jackson goes missing.
 * December 16, 2007- Jason Grace, Piper McLean, and Leo Valdez go to Camp Half-Blood and the Prophecy of Seven is set in motion.
 * December 17, 1928 - Hazel Levesque is born to Marie Levesque and Pluto.
 * December 17, 2007- Jason Grace, Leo Valdez, and Piper McLean begin their quest to save Hera.
 * December 19,2005- Bianca di Angelo is killed when she destroys Talos in the Junkyard of the Gods.
 * December 20, 2007 - Aeolus cancels his order for all demigods to be killed.
 * December 21 - Day of the Winter Solstice, when all the gods including Hades gather at Mount Olympus.
 * December 21, 2005-
 * Luke Castellan has a fall that would've killed him if he didn't bear the Curse of Achilles from Mount Tamalpais.
 * Percy, Grover, Thalia, and Zoë rescue Artemis, goddess of the hunt and the moon, and Annabeth from Dr. Thorn, a manticore.
 * Zoë Nightshade is killed from both the poison of Ladon and the blow from her father Atlas, while fighting him on Mount Orthys, the Titan base.
 * Atlas is retrapped under the sky.
 * A new constellation is formed by Artemis from the body of Zoë Nightshade, known as "the Huntress".
 * Thalia becomes the new lieutenant of the Huntresses of Artemis, declaring Percy Jackson as the child of the Great Prophecy.
 * December 21, 2007-
 * Jason, Piper and Leo rescue Hera from Gaea.
 * Porphyrion is resurrected from Tartarus at the Wolf House.
 * The Second Giant War begins.
 * December 22, 1986 - Thalia Grace is born to Ms. Grace and Zeus.
 * December 24, 2007- Christmas Eve
 * Leo, Jason, and Piper must find Leo's table Buford to prevent Bunker 9 from exploding.
 * While trying to locate Buford, they end up confronting Dionysus' crazed followers - the Maenads.