After retiring from racing he became a successful stallion and was the leading sire in Great Britain and Ireland in 1815, 1821 and 1822.
[2] On 2 June 1808 at Epsom Downs and racing for the Prince of Wales, Rubens started as the 10/3 second favourite for the Derby where he face nine rivals.
[3] Rubens was then purchased by 3rd Earl of Darlington and at Brighton in August he was one of four horses who contested the Pavilion Stakes.
[5] In April 1809 at the Newmarket First Spring meeting he won a Sweepstakes of 100 guineas each over one mile, after starting as the 4/7 favourite.
[7] In October he was intended to race against Oaks winner Morel at Newmarket, but Darlington paid a forfeit.
[9] On 23 April 1810 he beat odds on favourite Plover to win the Craven Stakes at Newmarket.
His unnamed daughter, the 1819 Rubens mare, was the dam of Phosphorus and two other classic winners.