Technically, sired by Shakespeare OR Marske.

Eclipse was born and named during the solar eclipse of 1764. His place of birth is unknown, but was probably at the Cranborne Lodge Stud of his breeder. Eclipse started racing at 5yo & was ridden by the jockey John Oakley who was the only one who could handle Eclipse's odd running style & temperamental nature.

Eclipse won all 18 races but retired in 1771 due to lack of competition, but it was no loss as he was a champion at stud. He is the champion sire of many famous racers including Young Eclipse, Saltram, Sergeant, Pot-8-os, King Fergus, Dungannon & Don Quixote. Nearly 95% of modern thoroughbred racehorses have Eclipse in their pedigree, and every Triple Crown Champion as well.
Eclipse died from colic in 1789.

Find more info at: http://www.tbheritage.com/Portraits/Eclipse.html.