 He began his stud career at the "bargain basement" fee of £500 but was the leading first-season sire in Britain in 1980.Mattaboy's dam Green Chartreuse won two minor races as a two-year-old in 1972 and was a half-sister to the Gran Premio del Jockey Club winner Stateff.She was a great-granddaughter of the broodmare Greenbridge, whose other descendants have included Minster Son.