This grand old horse just popped into my head for some reason. Know nothing about his connections but remember him as a fixture in the race.
A great story, taken from the nice potted history of the event linked below:
De Pluvinel ran in the Gold Cup no less than eight times from 1982 – 1990. Originally owned by Lt.Col J W Deacon and then by his former rider Guy Prest, he finished second on his first appearance in 1982, going one better twelve months later. He finished second again in 1984, 1987 and 1988, and proved there was life in the old horse yet when dramatically regaining his title in 1989. Not done yet, he won it for a third time in 1990 at the venerable age of 17. A truly remarkable racehorse.