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King Fergus was the damsire to Epsom Oaks winner Scotia. His son Overton was the sire of St Leger and Doncaster Cup winner Cockfighter. Beningbrough produced St Leger and Doncaster Cup winner Orville, Doncaster Cup winner Scud, Epsom Oaks and 4yo Great Subscription Purse winner Oriana, Epsom Oaks winner Briseis and another Doncaster Cup winner Trophonius. Hambletonian sired Doncaster Cup winner Camillus. It is through Hambletonian's son Whitelock that King Fergus' sire line continues. Whitelock was the sire of Blacklock, who was the grandsire of Epsom Derby winner Voltigeur.