One of the most interesting relics of the great priory is the altar-tomb, believed to be that of Robert de Brus of Annandale. The stone slabs are now built into the walls on each side of the porch of Guisborough Church. They may have been removed there from the abbey for safety at the time of the dissolution. Hemingburgh, in his chronicle for the year 1294, says: 'Robert de Brus the fourth died on the eve of Good Friday; who disputed with John de Balliol, before the King of England, about the succession to the kingdom of Scotland. And, as he ordered when alive, he was buried in the priory of Gysburn with great honour, beside his own father.' A great number of other famous people were buried here in accordance with their wills. Guisborough has even been claimed as the resting place of Robert Bruce, the champion of Scottish freedom, but there is ample evidence for believing that his heart was buried at Melrose Abbey and his body in Dunfermline Abbey. The central portion of the town of Guisborough, by the market-cross and the two chief inns, is quaint and fairly picturesque, but the long street as it goes westward deteriorates into rows of new cottages, inevitable in a mining country. Mining operations have been carried on around Guisborough since the time of Queen Elizabeth, for the discovery of alum dates from that period, and when that industry gradually declined, it was replaced by the iron mines of today. Mr. Thomas Chaloner of Guisborough, in his travels on the Continent about the end of the sixteenth century, saw the Pope's alum works near Rome, and was determined to start the industry in his native parish of Guisborough, feeling certain that alum could be worked with profit in his own country. As it was essential to have one or two men who were thoroughly versed in the processes of the manufacture, Mr. Chaloner induced some of the Pope's workmen by heavy bribes to come to England. The risks attending this overt act were terrible, for the alum works brought in a large revenue to His Holiness, and the discovery of such a design would have meant capital punishment to the offender. The workmen were therefore induced to get into large casks, which were secretly conveyed on board a ship which was shortly sailing for England. When the Pope received the intelligence some time afterwards, he thundered forth against Mr. Chaloner and the workmen the most awful and comprehensive curse. They were to be cursed most wholly and thoroughly in every part of their bodies, every saint was to curse them, and from the thresholds of the holy church of God Almighty they were to be sequestered, that they might 'be tormented, disposed of, and delivered over with Dathan and Abiram, and with those who say unto the Lord God, "Depart from us; we desire not to know thy ways."'