John Aubrey, in his book ‘Monumenta Britannica’ says:
“In Stanton Harcourt field in Oxford southward from the Towne stand two great stones, called the Devill’s Coytes: sixty-five paces distant from one another. The east stone is nine foot high, and as much broad: halfe a yard thick. The west stone is eight foot high and about six foot broad, halfe a yard thick.”
“One of these stones was taken down by a farmer about the year 1680 to make a bridge of.”
“Two or three Bowshotts from hence is a great Barrow.”
It’s not clear what this ‘great Barrow’ is – maybe Gravelly Guy? The distance feels about right.