In the pasture on the eastern bank of the Louther, In the way to Clifton, are several cairns, or carracks, as the Scotch call them, made of dry stones heaped together; also many other monuments of stones, three, four, five set upright together. They are generally by the country people said to be done by Michael Scot, a noted conjuror in their opinion, who was a monk of Holm abbey in Cumberland: they have a notion too that one Turquin, a giant, lived at Brougham castle; and there is a tower there, called Pagan tower; and Sir Lancelo de Lake lived at Mayborough, and flew him. Near Clifton is a famous spring, where the people go annually on May-day to drink, by custom beyond all remembrance: they hold it an earnest of good luck the ensuing year, to be there and drink of the water before sun-rise. This no doubt has been continued from British times, and is a remain of the great quarterly festival of the vernal equinox.
William Stukeley, Iter Boreale (northern tour of 1725) p45