The Leo Gold Cloth is the Cloth of the Saint Aiolia in Saint Seiya, Soul of Gold, and Saint Seiya: Episode G , by Regulus and Ilias in Saint Seiya: The Lost Canvas, by Kaiser in Saint Seiya: Next Dimension, and by Mycenae in Saint Seiya: Omega. It is of the highest class of the Cloths that Athena’s Saints wield, the Gold Cloths.
The Leo constellation was based on the Nemean Lion that Heracles faced as one of his legendary Twelve Labors. The creature’s hide was impervious, so he had to trap it in its cave and strangle it to death, using its claws to skin it. While Heracles was allowed to keep his pelt, the lion found it’s place in the sky, as a constellation.
Aiolia trained to be a Saint in Sanctuary, years before the birth of the modern Athena, by his brother, Sagittarius Aiolos *At least, according to the anime*. The Cloth was likely kept in Sanctuary until a Saint worthy of wearing it was found. Aiolia was ordered to kill the Bronze Saints, but learned of Athena’s place at their side and joined them. Saga used his “Phantom Demon Emperor Attack” to control Aiolia, and he fought Seiya until Cassios killed himself to snap Aiolia out of it. Aiolia also fought off and killed many Specters during the Hades Arc. He was eventually trapped in Hell when trying to help the Bronzes get to Hades. He returned from being frozen in Cocytus, and combined his powers with the other Gold Saints to destroy the Wall of Lamentations, dying in the process. When it was sent to Elyseum by Poseidon, Ikki donned the Cloth, until Thanatos shattered it.
Lost Canvas/Next Dimension : Previous War
Regulus was the Guardian of the fifth house of Sanctuary in The Lost Canvas, and the youngest of the Gold Saints during that era. He was called a genius and prodigy for his fast growth and ability to learn a foe’s weaknesses and strengths so quickly. Regulus helped defend the ship that the Saints were going to repair to travel to the Lost Canvas, fighting off Behemoth Violate, and defeating her, but falling to Garuda Aiacos. While being defeated, he wasn’t killed by Aiacos, just injured, as Sagittarius Sisyphus came to fight. Regulus met his end during the battle with Wyvern Rhadamanthys, who had gained the blood of Hades. He fell after injuring Rhadamanthys greatly, using attacks that should have been impossible. Before he became a Saint, his father Ilias was the Leo Gold Saint, and died fighting Wyvern Rhadamanthys.
During the events of the previous Holy War in Next Dimension, Kaiser was the Leo Gold Saint, guarding the Temple of the Lion during the assault on Sanctuary by the Specters. Upon arrival at the fifth temple, Andromeda Shun and Pegasus Tenma found that Garuda Suikyou was defeated by Kaiser’s armored sacred lion, Goldie. At first, he was opposed to letting any of them pass, but Goldie eventually showed affection to them all, making Kaiser have his doubts. It didn’t take long for Cancer Deathtoll to show up with several Specters. Kaiser questioned his loyalty, as Goldie took care of the Specters. But, the Worm Specter attacked him; Kaiser breaking his hold. After finishing Worm, Deathtoll told Kaiser that Suikyou was going to fight on, and likely die, despite injuries; that he should pity the man. Kaiser let the Bronze Saints go, knowing they would have to go to the Temple of the Maiden next.
In Saint Seiya: Episode G, Aiolia is a younger, more distant Saint, not trusted by his fellow Gold Saints. A mission to prevent an insane, rejected Saint trainee from blowing up a nuclear reactor is the start of events that would change his life. Making new friends, he ends up having to prove himself to the others as the Titans attack Sanctuary, aiming to steal back Cronus’ weapon back from them.
Mycenae is the man who was chosen to be the Leo Gold Saint in Saint Seiya: Omega. First appearing at the Tower of Babel, he was quickly revealed to be loyal to Mars, and for the false Athena taking over. He proved to be too much for the Bronzes, driving them away. Later, he is revealed to be the one who trained Orion Eden. He fought to defend Mars’ Sanctuary, but he found himself convinced of the Bronze Saints’ position and went to help, but fell to Pisces Amor.