Its primary object was to authenticate the relics of St James at Compostella.
His last chemical paper, published in 1788, on the "Conversion of a mixture of dephlogisticated and phlogisticated air into nitrous acid by the electric spark," describes measures he took to authenticate the truth of the experiment described in the 1785 paper, which had "since been tried by persons of distinguished ability in such pursuits without success."
The legend probably originated in a desire to authenticate the relics in the abbey of Saint Denis, supposed to have been brought to Aix by Charlemagne, and is preserved in a 12th-century romance, Le Voyage de Charlemagne a Jerusalem et a Constantinople.'
Furthermore, this belief that prophecy had ceased led the religious personalities of the later time to authenticate their message by means of antedated prophecy.
They have the experience and knowledge to help you know what to look for, where to find it and how to authenticate its accuracy.