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Samuel Gist, a prominent landowner, slave owner, banker, as well as a partner with George Washington, contributed to the eventual breeding of what became known as the Conestoga. Gist became famous by founding the Gist settlements, including one southwest of Leesburg, Ohio, and freeing his slaves, albeit only through his will after dying. The lineage of the Conestoga is not clear and there is more than one possibility. In 1774 there were 50 English stallions and 30 mares imported into Virginia. These either came from Byerley Turk, the Darley Arabian, or the Godolphin Arabian. Gist imported a Darley Arabian stud named "Bulle Rock" from England in 1732. Breeding this horse and descendants with Virginia mares led to larger size horses. These mares, bred with studs of Flemish ancestry, were reportedly brought to the United States by William Penn, but this has been asserted as lore.