Lease by William Lewis, Lord Dinorben, to James Hughes of Llysdulas (his younger brother), Stephen Roose of Amlwch, and Thomas Williams of Beaumaris, upon the copper and other ore under Rhosmanach Ganol, Rhosmanach Ucha, Brynyfuches, and Cae Glan y Mor in the parish of Llanwenllwyfo; 21 years; royalty "one full and clear tenth part share or dish, of all copper ore, etc .... raised or brought to grass out of the said premises".