The Heracles Cloth is a Silver Cloth, the cloth of the Saint Algethi in Saint Seiya and an unknown Saint in Saint Seiya: The Lost Canvas.
The Hercules constellation represents the legendary Greek Hero and demi-god son of Zeus. Probably attributed to him for his completion of the Twelve Labors, and his eventual ascension into godhood.
Algethi trained to be a Saint in Uganda, by an unknown master. He follows the orders of the Pope, and is among the three Silver Saints to follow Leo Aiolia, in case he should betray Sanctuary. Algethi and the other two Silver Saints attempt to kill Seiya, but he kills all three of them with the Sagittarius Gold Cloth. Algethi fares the best of the three, getting his special attack and an extra uppercut to Seiya, before Seiya kills all three of them.
The Hercules Saint was killed early on while trying to keep Griffon Minos out of Sanctuary, in The Lost Canvas. The previous wearer of the Cloth comes back when Hakurei calls for those who fought with him in the previous Holy War.