The Sagittarius Gold Cloth is the Cloth of the Saints Aiolos in Saint Seiya, Soul of Gold, and Saint Seiya: Episode G, Sisyphus in Saint Seiya: The Lost Canvas, and by Seiya in Saint Seiya: Omega. It is of the highest class of the Cloths that Athena’s Saints wield, the Gold Cloths.
The Sagittarius constellation was based on the centaur, Chiron, born of Cronus in the form of a horse and the nymph Philyra, was a legendary Centaur, a healer, a teacher, and notably, an Archer. He was poisoned by one of Heracles’ Hydra-poisoned arrows, and could not cure himself, nor die due to immortality. Rather than live on with the pain, he gave up his immortality to take Prometheus’ place in Tartarus, in sacrifice. In recognition of this, Zeus placed him in the sky as a constellation.
Aiolos trained to be a Saint in Sanctuary, years before the birth of the modern Athena, by an unknown master. The Cloth was likely kept in Sanctuary until a Saint worthy of wearing it was found. Aiolos first appeared in volume 6 of the manga, in a flashback where he took the baby Athena and his Gold Cloth away from Sanctuary, while dying. After a fatal blow from Shura’sExcalibur while fleeing, he had found Mitsumasa Kido and gave him the Cloth and baby, before dying. He briefly appeared as a spirit when Leo Aiolia fought Seiya, while he wore the Sagittarius Gold Cloth. His Cloth would assist them several more times, revealing his message in The House of the Archer and to defend Seiya while he fought Poseidon. He returned from the dead in his Cloth, and the other Gold Saints combined their power into his arrow to destroy the Wall of Lamentations, which ended up killing him. When the Sagittarius Gold Cloth was sent to Elyseum by Poseidon, Seiya donned the Cloth, until Thanatos shattered it.
Lost Canvas / Next Dimension : Previous War
Sagittarius Sisyphus was the Guardian of the House of the Archer in The Lost Canvas. Sisyphus is the one who brought Sasha to Sanctuary to become their Athena, building a bond with her in the process. During some mission, he discovers about the Dream Gods while trying to learn of Thanatos and Hypnos. When Hades invaded Sanctuary, Sisyphus shot an arrow at him, but it was reflected, piercing his chest. On top of that, his Cosmo was sealed, and the Dream Gods trapped his soul in the Dream World. He is awakened by Athena when El Cid and Tenma fight Oneiros. He shot an arrow towards them from Sanctuary after waking up, in a last ditch shot at helping the fight. He would later take the lead of the Saints. He would later fight Garuda Aiacosto defend their ship to the Lost Canvas. He gouged out his eyes during the fight, and was able to reach the Eighth Sense, his Cosmo rising as well due to the loss of sight. He was able to beat Aiacos because of the growth of his power. Weakened and injured, he offers his heart to Sphinx Pharaoh, proves his purity, and kills the Specter. Dying from the injury, he combines his powers with Leo Regulus and Aries Shion to do the Athena Exclamation, forcing the Lost Canvas gates open. He dies afterwards, remembering his devotion to Sasha.
In between the end of the Classic Series and the start of Omega, Seiya was promoted to Sagittarius Gold Saint. Mars appeared before Athena, and injured her, but Seiya came to her rescue, driving Mars away, and disappearing. 13 years later, Seiya appears to the new Pegasus Saint, Kouga, encouraging him as he tries to defend Athena, and yet again, to leave a message to the Bronze Saints, like Aiolos did before him. Seiya had disappeared for a while, but it was revealed that he was sealed on Mars, and was freed in time to fight off an Absu-possessed Kouga, managing to free him, but in the process damaging the Cloth some. With his own Cloth damaged beyond repair, Kouga briefly took possession of the Sagittarius Gold Cloth to fight Absu and save Athena. Having succeeded in his battle, Kouga returned the Cloth to Seiya, who is still in possession of it to this day.