This singular tower was round, and of great height and grandeur; erected upon a lofty rock, and surrounded by crags and precipices. The foundation was supported by four brazen lions, each taller than a cavalier on horseback. The walls were built of small pieces of jasper, and various coloured marbles, not larger than a man’s hand; so subtilely joined, however, that, but for their different hues, they might be taken for one entire stone. They were arranged with marvellous cunning, so as to represent battles and warlike deeds of times and heroes long since passed away; and the whole surface was so admirably polished that the stones were as lustrous as glass, and reflected the rays of the sun with such resplendent brightness as to dazzle all beholders.[11] King Roderick and his courtiers arrived wondering and amazed, at the foot of the rock. Here there was a narrow arched way cut through the living stone; the only entrance to the tower. It was closed by a massive iron gate, covered with rusty locks of divers workmanship, and in the fashion of different centuries, which had been affixed by the predecessors of Don Roderick. On either side of the portal stood the two ancient guardians of the tower, laden with the keys appertaining to the locks. The king alighted, and, approaching the portals, ordered the guardians to unlock the gate. The hoary-headed men drew back with terror. “Alas!” cried they, “what is it your majesty requires of us. Would you have the mischiefs of this tower unbound, and let loose to shake the earth to its foundations?” The venerable archbishop Urbino likewise implored him not to disturb a mystery which had been held sacred from generation to generation, within the memory of man; and which even Cæsar himself, when sovereign of Spain, had not ventured to invade. The youthful cavaliers, however, were eager to pursue the adventure, and encouraged him in his rash curiosity. “Come what come may,” exclaimed Don Roderick, “I am resolved to penetrate the mystery of this tower.” So saying, he again commanded the guardians to unlock the portal. The ancient men obeyed with fear and trembling, but their hands shook with age, and when they applied the keys, the locks were so rusted by time, or of such strange workmanship, that they resisted their feeble efforts; whereupon the young cavaliers pressed forward and lent their aid. Still the locks were so numerous and difficult, that with all their eagerness and strength a great part of the day was exhausted before the whole of them could be mastered.