Koh-i-noor (光の山 Kō-ī-nūru ), real name Krest (クレスト Kuresuto ) is the 500+-year-old man mentor of Aquarius Dégel, and the former Aquarius Gold Saint (several generations before Dégel). He is named after the Koh-i-noor diamond.
Holy War XIII
Krest is an old gold saint, the Aquarius Gold Saint of the XIII who, after numerous battles and holy wars (against Hades, Poseidon, Ares and other gods). He is no longer a saint but still faithful to the shrine, became the Master of Aquarius Degel. He's a survivor of the penultimate XIII Century Holy War. Since then, he never stopped to ensure the safety of the Sanctuary of Athena and the youth of the new generation of Protectors of the Earth.
Lost Canvas Anecdotes
Almost forty years after that, Krest was at the Sanctuary in Greece after more than a century, at which time he met a young heart patient named Kardia, and (surprised by the determination of the child to live up despite the heart disease) taught him a technique to take advantage of that disease. The boy was later known as the Scorpio Kardia and also the best friend of Aquarius Degel.
Was kidnapped by Mrs. Garnet and sends a letter to the sanctuary in which the only thing he said was, "Help me." Then appears telling that he was unchanged to Degel. Krest always said that they should save the Field. Continued the great battle against his student, Krest lost, and was frozen. Then Garnet reveals that this had been a test for Degel and a test to see whether their way of life was the one.
The Koh-i-Noor diamond
The Koh-i-Nur, meaning "Mountain of Light" in Persian, is a diamond of 105 carats (21.6 grams in his court later), was once one of the largest diamonds in the world. The Koh-i Nur is from the state of Andhra Pradesh in India as well as his double, the Darya-ye Noor ("Light of the Sea"). It belonged to Hindu rulers, Mughal, Persian, Afghan, Sikh and British, who fought bitterly for him at various points in history and was taken as a war trophy again and again. At the end of the East India Company remained with it to make it part of the British Crown Jewels when Queen Victoria was Empress of India proclaimed in 1877.