Shireborn reportedly same from the royal stables of the Stuart monarch Anne, Queen of Great Britain.
She was imported by Benjamin Tasker, Jr. of Maryland around September 1750, at the age of 5, and was supposedly pregnant when she was shipped across the Atlantic, according to the Earl of Godolphin's studbook.
Having turned up the original manuscript stud books kept by Edward Coke, the man who brought the Godolphin Arabian into England from France, and by the Earl of Godolphin, to whom the horse passed after Coke's death and whose property he remained throughout the rest of his (the stallion's) life, Mr.
Prior discovered in them the authentic entry of her foaling upon April 30, 1745; that her dam was the Shireborn Mare, by Hobgoblin and of the maternal family stemming from Queen Anne's Moonah Barb Mare; and that she was a bay 'with a Small Star & a Little of ye near hind Heell white'.
The notation following: 'This Filly sold to Mr. Tasker into Maryland', with the further statement that she was sent there in September, 1750, being plenary verification of her origin and ancestry."