In 2006 Holy Roman Emperor won two Group One races, the Phoenix Stakes where he defeated the Coventry Stakes winner Hellvelyn and subsequent Group One winning filly Miss Beatrix and the Prix Jean-Luc Lagardère where he defeated the useful French colt Battle Paint.
He also defeated subsequent three-year-old mile champion Excellent Art producing a blistering turn of foot to win the Group Two Railway Stakes at the Curragh.
There was great anticipation of another year of races between the pair, but it was decided in March 2007 to retire Holy Roman Emperor to stud as a replacement for George Washington, who was suffering fertility problems (and was also a son of Danehill).
Holy Roman Emperor's first runner in the UK or Ireland, High Award trained by Tommy Stack won at the Curragh on March 21, 2010.
Holy Roman Emperor is the sire of 14 individual Group 1 winners: c = colt, f = filly, g = gelding