High Quality Content by WIKIPEDIA articles! The Byerley Turk or Byerly Turk, (c.1684-1706) was the earliest of three stallions that were the founders of the modern Thoroughbred horse racing bloodstock (the other two are the Godolphin Arabian and the Darley Arabian). The stallion is believed to have been captured by Captain Robert Byerley at the Battle of Buda (1686), served as Byerley`s war horse when he was dispatched to Ireland in 1689 during King William`s War and saw further military service in the Battle of the Boyne. The General Stud Book simply states, without reference to his origins, that both man and horse were in Ireland: BYERLY TURK, was Captain Byerly`s charger in Ireland, in King William`s wars (1689, c.).