Galileo, Coolmore Stud’s stallion phenomenon who has rewritten the record books over the last two decades, has died at the age of 23.

A star in the making since birth, Galileo won not only the 2001 Derby but the Irish equivalent and the King George before becoming the most prolific source of Group 1 winners in thoroughbred history with 91 and counting.

The son of Sadler’s Wells has been responsible for Frankel, Australia, Nathaniel and Waldgeist, while Joan Of Arc and Empress Josephine are among his more recent top-level scorers.

Coolmore announced via social media on Saturday that Galileo had been put to sleep “on humane grounds owing to a chronic, non-responsive, debilitating injury to the left fore foot”.