In accordance with his father’s wishes, Philip III. began to build the present burial-vaults soon after his accession to the throne. He did not live to see the completion of the work, which was continued during the reign of Philip IV. The construction was, however, delayed through the attitude of the overseer of the works, who objected to the expenditure of so large a sum of money from the national exchequer; but under the monk Nicolas, the _Panteon_ was at length made ready, in 1654, for the reception of the coffins of members of the royal families. ‘No monarchs of the earth,’ writes a chronicler, ‘have a mausoleum comparable to this of the Escorial, which to the glory of Spain was conceived by Charles V., undertaken by Philip II., carried on by Philip III., and completed by Philip IV.’ The second devastating fire at the Escorial broke out in 1671, and was supposed to have been caused by the fall of a rocket during a firework exhibition, following upon a day of rejoicing. The English translator of the works of Francisco de los Santos states that the fire ‘ruined and destroyed’ the edifice, but this is an exaggeration, though the damage was very great. It is said that the flames were not quenched for fifteen days, and that the peal of bells was melted. The queen-regent, Anne of Austria, restored the Escorial in 1676, and provided it with a new set of bells. Another disaster might have befallen the Monasterio in 1755, when Lisbon was levelled by the great earthquake, but, fortunately, only a shock was perceived by the inmates of the building. Charles III. made a few additions to the Escorial, and his son proposed the addition of a bull-ring; but the king, upon hearing of this project, forbade the work, and the prince contented himself with erecting a caseta or villa, which was named de Abajo. It was at the Escorial that Charles IV. unearthed a plot concocted by the queen, Godoy, and Prince Fernando, with the object of betraying Spain to France. The prince was placed in confinement at the Monastery, and his tutor and other members of the royal household were also imprisoned. It is probable that Canon Escoiquiz, one of the Court, was in treaty with Napoleon’s representatives. Fernando was tried and pardoned, though his part in the conspiracy seemed to admit of no doubt. In 1807 the French troops stormed the Monasterio, which was defended by the priest Ruiz, who lost his life in the assault. The monks were expelled by the French, but allowed to occupy an adjacent building. Terrible pillage succeeded the capture of the Escorial, and much of its treasure was looted and sent to France. After the Peace the brethren returned to the Monastery, and the French restored some of the plundered works of art. There was a restoration of the building under Ferdinand VII., the completion of the work being celebrated on the day of San Lorenzo. Upon the death of the king many of the pictures were transferred from the Escorial to Madrid.