 Regulus was by the Godolphin Arabian, his dam, the noted Grey Robinson, by Bald Galloway and out of Sister To Old Country Wench (dam of Squirt ) by Snake, out of Old Grey Wilkes, a daughter of Old Hautboy.After the death of Lord Chedworth Regulus was sold to Mr Martindale while he was still a maiden horse.Regulus was a successful racehorse, winning 8 royal plates in 1745 and a £50 plate.