A race called the Peterborough Handicap Chase, over three miles, was first run on Tuesday 2 December 1969.
The 2018 running was titled the Edredon Bleu Chase to honour the horse, who died in October 2018.
Courtesy of Edredon Bleu's four wins, Racing Demon's two victories and additional successes from triple-Gold Cup winner Best Mate (2002) and Impek (2005), Henrietta Knight is the joint most successful trainer of the Peterborough Chase, winning a total of eight renewals.
Desert Orchid, lining-up in the penultimate race of his long career, finished third in the 1991 Peterborough Chase.
Ridden by Richard Dunwoody, the 12-year-old veteran finished third to Sabin Du Loir, beaten four lengths.