The dogma of transubstantiation was particularly fruitful of such exhibitions. The festival of _Corpus Christi_, designed for the furthering of this dogma, was instituted by Pope Urban IV. in 1264. Within a few years from that date Miracle-Plays were annually performed at Chester during Whitsuntide: they were also introduced at Coventry, York, Durham, Lancaster, Bristol, Cambridge, and other towns; so that the thing became a sort of established usage throughout the kingdom. A considerable variety of subjects, especially such as relate to the Incarnation, the Passion, and the Resurrection, was embraced in the plan of these exhibitions; the purpose being to extend an orthodox belief in those fundamentals of the faith.
A very curious specimen of the plays that grew out of the _Corpus-Christi_ festival was lately discovered in the library of Trinity College, Dublin, the manuscript being, it is said, as old as the reign of Edward IV., who died in 1483. It is called _The Play of the Blessed Sacrament_, and is founded on a miracle alleged to have been wrought in the forest of Arragon, in 1461. In form it closely resembles the Miracle-Plays founded on Scripture, the Saviour being one of the characters, the others being five Jews, a bishop, a priest, a merchant, and a physician and his servant. The merchant, having the key of the church, steals the Host, and sells it to the Jews, who promise to turn Christians in case they find its miraculous powers verified. They put the Host to various tests. Being stabbed with their daggers, it bleeds, and one of the Jews goes mad at the sight. They next attempt nailing it to a post, when one of them has his hand torn off; whereupon the physician and his man come in to dress the wound, but after a long comic scene are driven out as quacks. The Jews then proceed to boil the Host, but the water forthwith turns blood-red. Finally, they cast it into a heated oven, which presently bursts asunder, and an image of the Saviour rises and addresses the Jews, who make good their promise on the spot. The merchant confesses his theft, declares his penitence, and is forgiven, under a strict charge never again to buy or sell. The whole winds up with an epilogue from the bishop, enforcing the moral of the play, which turns on the dogma of transubstantiation.