When the unfortunate Baldwin II became Emperor of the East in 1237, the relics of the passion were his best asset. In 1238, while Baldwin was in France trying to obtain aid, the French barons who carried on the government at Constantinople in his absence were obliged to pledge the crown of thorns to an Italian syndicate for 13,134 perpera, which Gibbon conjectures to have been besants. Baldwin was notified of the pledge and urged to arrange for its redemption. He met with no difficulty. He confidently addressed himself to Saint Louis and Queen Blanche, and “Although the king felt keen displeasure at the deplorable condition of Constantinople, he was well pleased, nevertheless, with the opportunity of adorning France with the richest and most precious treasure in all Christendom.” More especially with “a relic, and a sacred object which was not on the commercial market.” [Footnote: Du Cange, _Histoire de L’empire de Constantinople sous les empereurs Français_, edition de Buchon, I, 259.] Louis, beside paying the loan and the cost of transportation which came to two thousand French pounds (the mark being then coined into £2, 15 sous and 6 pence), made Baldwin a present of ten thousand pounds for acting as broker. Baldwin was so well contented with this sale which he closed in 1239, that a couple of years later he sent to Paris all the contents of his private chapel which had any value. Part of the treasure was a fragment of what purported to be the cross, but the authenticity of this relic was doubtful; there was beside, however, the baby linen, the spear-head, the sponge, and the chain, beside several miscellaneous articles like the rod of Moses. Louis built the Sainte Chapelle at a cost of twenty thousand marks as a shrine in which to deposit them. The Sainte Chapelle has usually ranked as the most absolutely perfect specimen of mediaeval religious architecture. [Footnote: On this whole subject of the inter-relation of mediæval theology with architecture and philosophy the reader is referred to _Mont-Saint-Michel et Chartres_, by Henry Adams, which is the most philosophical and thorough exposition of this subject which ever has been attempted.] When Saint Louis bought the Crown of Thorns from Baldwin in 1239, the commercial value of relics may, possibly, be said to have touched its highest point, but, in fact, the adoration of them had culminated with the collapse of the Second Crusade, and in another century and a half the market had decisively broken and the Reformation had already begun, with the advent of Wycliffe and the outbreak of Wat Tyler’s Rebellion in 1381. For these social movements have always a common cause and reach a predetermined result.