1461-63 A lot and cope at Hartington and in Wirksworth Socage was farmed, for 10 years, to John and Robert Fitzherbert for lead smelting. [1]
[1] I. S. W. Blanchard, "Derbyshire Lead Production, 1195-1505," Journal of the Derbyshire Archaeological and Natural History Society 91 (1971), 119-140, at 137.