It is probably entirely Arab. It encloses a quadrangular space of about a quarter of an acre, and is a ruin; but the walls and towers are almost entire. There are three small towers, that is of small diameter, but lofty; and two larger, one of which is circular: the other is a parallelogram terminating by a semicircle at one of its extremities. This tower has lost apparently about a third of its elevation. Their walls are so perfectly constructed as to appear externally like solid rocks smoothed and rounded. Each larger tower contains two rectangular brick projections, in which are small elegantly-arched openings for windows. The edifice was thoroughly repaired by Don Pedro Tenorio, archbishop of Toledo; the same who built the bridge of San Martin. It has since played its part in numberless wars, and was at length reduced to a ruin during the insurrection headed by Juan de Padilla, at the commencement of Charles the Fifth's reign. During the Peninsular war of the present century, the old battlements echoed once more with the sounds of warfare. It was occupied by a body of French, who repaired a portion of the masonry at the summits of the towers, and erected a low wall along the whole length of the Toledo side. They were able, from their position, to batter the Alcazar, which is immediately opposite, but on a higher level; and to command the bridge of Alcantara, and road to Aranjuez. In the other valley which extends to the west of Toledo exist the remains of a circus for chariot races, generally supposed, at first sight, to be Roman. They present, in fact, every characteristic of a Roman work. The rough interior masonry is all that remains; and that only rising to a height of from three to four feet from the ground, with the exception of a single arch. The earth mingled with ruins, has apparently filled up much of the interior, and surrounding the exterior simultaneously, has only left visible the upper portion of the edifice. The end which is in the best preservation is of a semicircular form. From it the sides run in parallel directions, and lose themselves in the ruins of a more recently erected convent. They are traceable to a length of more than four hundred yards. The width is two hundred and ninety feet within the building, at the present elevation of the ground, and three hundred and twenty feet on the outside, which appears to have consisted of a series of arches. There are also remains of an amphitheatre adjoining the semicircular end of the stadium. There being no indication of the Romans having at any period planted any considerable establishment at Toledo, in fact no author but Livy having noticed the place, and he but slightly; the antiquaries have sought for the origin of these monuments among Gothic traditions; and it is believed by them, that they were erected during the early part of the sixth century, by Theudio, a Gothic King, who manifested much attachment to Roman customs. LETTER XIII.