In Greek mythology, Athena, the daughter of Zeus, was born in full armor. By birthright the goddess of battle, she did not believe in conquest, and only fought defensive wars. Her battles with bloodthirsty gods and giants shook the very earth and seemed to last forever. On the battlefield, there were a group of youths that always surrounded and protected the goddess: the Knights of Athena! Flash forward to modern-day Greece: two Japanese tourists are shocked to see a mansized meteorite crash to the earth before them. It turns out to be young Seiya. Seiya must train harder than ever if he is to survive his match with the brutal Cassios! Whoever wins will receive the greatest prize known to man: the incredibly powerful Pegasus Cloth!
 
(Source: Viz Media)
 
Note: The chapter count includes 247 regular chapters and 2 extra chapters ("SHAKA" and “The Cygnus Story - Natassia of the Land of Ice”), other editions merge chapters into a total of 110 chapters.

Hades is planning to take over the world, to achieve that goal, he sends out deceased Gold Saints to take Athena's head. Seiya and the other Bronze Saints come to help but their help isn't appreciated by the remaining Gold Saints that are still alive.
 
(Source: Anime News Network)

Seiya and the rest of the Bronze and Gold Saints who have survived the Sanctuary battle have entered the world of the Dead. They are fighting to get to Hades and defeat him.
 
(Source: Anime News Network)

Ages ago, the goddess Athena was served by fighters called Saints who channeled the power of the Cosmos within them. Now a youth named Seiya has trained to become a Saint himself by earning the mystical Cloth of Pegasus. He is joined by other Saints with Cloths of their own to fight for Athena. 
(Source: Anime News Network)

After the 12 Gold Saints sacrifice their lives to destroy the Wailing Wall, The Bronze Saints enter the deepest realm of the Underworld, Elysion, where they face off aganist Hades's two most powerful servants: The Twin Gods, Hypnos and Thanatos, before they can reach Hades for the final battle.

In the wake of a space-wide civil war instigated by Saga–the Gemini Gold Saint–a new team of Saints comes together with the goal of protecting their goddess Athena. This first all-woman team of armored warriors, powered by the Zodiac, will use their cunning, strength, and compassion to defend their worlds and oppose their very destinies. Mangaka Chimaki Kuori is also known for working on manga for Gundam Seed and the Persona series. 
(Source: Seven Seas Entertainment)
 
Note: The chapter count includes 86 regular chapters, 2 "Extra Story" chapters included at the end of volumes 7 and 16, and a prologue and one special chapter that were omitted from collected volume releases.

Zeus had a daughter named Athena, the goddess of war. A group of youths flocked to Athena fighting to protect her amidst heroic battles as her "Saints". Their proof of being a Saint laid with the battle protector known as Sacred Cloth. 
 
After a virtual eternity, a new struggle is about to unfold now again over the Cloth. A boy named Seiya has crossed way over to Greece to undergo the training to become a Saint and obtained the Cloth, Bronze cloth, the lowest position among Saints. Every Saint takes a constellation as their tutelary god. And Seiya's guardian star is Pegasus. Now, the saints gather together from all over the world to participate in the "Galatic War" - championship of Saints, aiming at the Gold Cloth, the symbol of ruler of the Saints. The curtain for Galatic War has been cut open. During the death battle between the Saints, Phoenix, the Black Saint, suddenly appeared on the scene and runs off with Gold Cloth in front of a full house in his ambition to become ruler of the world. Seiya and his fellow bronze cloth warriors go after Phoenix and his "Shadow Army" to retrieve the lost Gold Cloth... 
 
The battles waged among the saints, the strongest young men on earth, begin now! 
 
(Source: Toei Animation)

In 1990 (previously 1986), in Elysion; the five Bronze Saints Seiya, Hyōga, Shun, Shiryū and Ikki, having wreaked havoc in the Underworld's army and succeeding in resurrecting the God Cloths, engage the god Hades in a final duel to the death. 
During the battle, Hades remembers that he has seen Seiya's face before and comes to the conclusion that he faced him before. He thus starts reminiscing about his previous host body, and the story starts 247 years prior, in the 18th century. 
The protagonist, the Pegasus Saint of this era, is an orphan who is best friends with a boy named Alone, the host of Hades. Former Bronze Saints Dohko and Sion, two prominent characters in Kurumada's original manga as the sole survivors of the holy war of that century, have just been promoted to Gold Saints and eventually the two duos meet.
 
Note: The chapter count includes 118 regular chapters, 2 special chapters included in volume 10, and a prologue.

This manga tells the story of the previous Holy war of the universe of Saint Seiya, taking place in the XVIII century, 250 years before the original manga. The story centers on the relation between Tenma, the Pegasus Saint and his beloved friend, Alone, who would eventually become his greatest enemy, Hades. 
(Source: Wikipedia)

In ancient times, the Titan Cronos (son of Uranus the sky and Gaia the earth) and his wife Rhea gave birth to six children. Five of them were swallowed by Cronos, and only one was saved, Zeus, hidden from Cronos by Rhea. Upon reaching adulthood, Zeus forces his father to vomit the other five gods. Zeus, along with his brothers and sisters, decide to battle the Titans for control of the universe. Cronos and the other eleven Titans lose the battle and are sent to Tartarus.
 
Thousands of year later, in Greece, the Pope visits the room of the recently reincarnated infant Athena, with a golden dagger. Before he can kill her, the Gold Saint Saggitarius Aiolos saves her, and unmasks the Pope. Aiolos, horrified, flees. The Pope declares him a traitor to the Sanctuary, and has Capricorn Shura murder him. This causes his younger brother, Leo Aiolia, to grow under the shadow of his "traitor" brother, suffering from all manner of abuse and scorn. This leaves him with a grudge against the Gold Saints and Sanctuary as a whole, which causes the Pope and most of the Sanctuary to distrust him. To make things worse, the enemies of God Zeus, the Titans, are revived and begin to seek vengeance against him and the Sanctuary. This marks the start of Aiolia's story and the battle of the Gold Saints against the Titans.
 
(Source: Wikipedia)
 
Note: The chapter count includes 87 regular chapters, 20 "Gaiden" extra chapters, and an epilogue that was omitted from collected volume releases.

The Champion RED magazine teases the story as a prequel to Saint Seiya, with a conspiracy brewing under the shadow of rival brothers Saga and Kanon, and a new mystery being unraveled. 
 
(Source: Anime News Network, edited)

Shouichirou was just another high school student. Now, he's Wyvern, one of the dreaded Judges of the Underworld, chosen to battle against the forces of Athena in a war that transcends life and death.
 
When an unexpected ambush during a school trip sends Shouichirou and his classmates into the land of the dead, they are thrust into a fierce struggle between the gods and their warriors. The mysterious forces of Hades have already begun their assault, and Shouichirou's destiny is forever altered. But he's not alone—Cattleya, the reincarnation of Athena herself, fights to defend the living, as shocking truths about a darker conspiracy threaten everything they know.
 
(Source: Titan Manga)

The story takes place between Poseidon and Hades. 
Athena and their knights must fight against powerful giants who lives on mount Etna, on the Italy.

This story takes place before the beginning of the war with Poseidon's army, focusing on Kanon's perspective of the events.

The Mythology is the plan of the gods. A perfect story created by them, that should never be changed in any way. However, there where mortals who altered the Mythology with their own hands. Pegasus Seiya, Ryuji Takane, Kojiro of the Fuuma, and many others were brought to this prison, where they're going to be erased to restore the Mythology to its original course... But they're not going to disappear without fighting for their existence.

Part 2 of Saint Seiya: Knights of the Zodiac, adapting the "Silver Saints" arc from the original manga.

The young warriors who protect the goddess Athena are known as the Knights of the Zodiac. One young orphan, Seiya, is destined to become the Pegasus Knight. Athena has been born into this world, but this time under a dark prophecy that she will lose the war against Poseidon and Hades, and lead mankind to ruin. Seiya stands up against the prophecy, willing to protect her at all cost. But now a god-killer arrow has struck her heart. To save her life, Seiya must ascend Sanctuary and defeat twelve legendary Gold Knights - and he only has twelve hours to do it. Will he make it? And what will happen to the dark prophecy if he succeeds?
 
(Source: Crunchyroll News)

A CG anime to commemorate the 25th anniversary of the series and the 40th anniversary of its mangaka.

From the dawn of time, there have been warriors who protected the Goddess Athena. Once forces of evil appear, these warriors, called the Saints will present themselves. 

A young woman, Saori Kido, learns about this force known as "Cosmos" and that she is the reincarnation of Athena, protector of love and peace on Earth. However, the Pope of the Sanctuary, who is in the charge of all the Saints, does not take kindly to Saori, and targets her for usurping the identity of Athena. An assassin is sent out to kill her. Fortunately, one of the Bronze Saints, Seiya, manages to protect her. But will Seiya be able to protect Saori through to the end in the gripping saga of Saint Seiya: Legend of Sanctuary?

The sanctuary is exhausted after the battle against the Lord of Darkness Hades.
 
In the absence of Seiya and the others, the land was about to meet its end in the wrath of the goddess Nemesis!
 
At that moment, the Emperor of the Sea Poseidon awakens to Hades' call and, together with the Seven Marina Generals challenges Nemesis and their Heroic Souls who serve her in battle!

The final hour is approaching! There are only five hours left until the arrow of the God Killer pierces Athena's heart. Only the Pope, who sits atop the sanctuary, can save Athena. However, in order for Seiya and the other four Bronze Saints to reach the Pope's Chamber, they must break through the Twelve Palaces protected by the Golden Saints. There are five more palaces waiting for them to reach the Pope's Chamber. Can Seiya and his team defeat the powerful enemies that stand in their way and reach the Pope's Chamber, where the shocking truth is hidden? 
 
(Source: Crunchyroll News)

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