| Alcock's Arabian | |
|---|---|
 Alcock's Arabian | |
| Breed | Thoroughbred |
| Sire | Curwen's Bay Barb |
| Dam | Old Wen Mare (Sister to Clumsey) |
| Damsire | Hautboy |
| Sex | Stallion |
| Foaled | c. 1700 |
| Country | Great Britain |
| Colour | Grey |
| Breeder | Sir J. Parsons |
| Owner | Mr Alcock Mr Charles Pelham Peregrine Bertie, 2nd Duke of Ancaster and Kesteven |
| Awards | |
| Champion sire in Great Britain and Ireland (1728) | |
Alcock's Arabian (foaled about 1700, died about 1733), also known as Pelham Grey Arabian and less certainly as Bloody Buttocks and Ancaster Turk, among other names, is the ancestor of all grey-coloured Thoroughbred horses,[1] as well as grey sport and riding horses descended from Thoroughbred lines.
- ^ Lady Wentworth, The Swift Runner: racing speed through the ages (G. Allen & Unwin, 1957), p. 27: "All grey thoroughbreds are descended in direct (though not exclusively male) line from the Grey Alcock Arabian, also known as the Brownlow Turk, Honeywood Arabian and Akaster Turk, the grey colour persisting through some 26 generations..."