Bay Middleton
Captain William George Middleton (16 April 1846 – 9 April 1892) was a noted British horseman, officer of the Royal Lancers, and equerry to Lord Spencer, Lord Lieutenant of Ireland. He was described as "one of the best riders to hounds that ever lived, an amusing dare-devil and very good company."
His nickname "Bay" was either a reference to his reddish-brown hair, or derived from the name of the winner of The Derby winner in 1836.