1149, and that the awkward arrangement to which I have just referred was, in fact, the result of some accident or change of plan. This supposition would reconcile more satisfactorily all the difficulties of the case than any other, and would tally well with what I have been able to learn as to the history of the church. The body of San Isidoro was sent for rather suddenly, and brought from Seville, and the King had but short time for the preparation of the building for its reception. Two years later the body of San Vicente was brought from Avila, and no doubt the popularity of the two saints soon made it necessary to enlarge the church. Then it might well happen that the old church was left in its integrity, and the new building added to the east, but with its north wall in a line with the north wall of the old one, so as to allow of the cloister being built along their sides, and without at all disturbing the early church or its relics. The relative position of the churches makes it probable, in short, that the large church was added to the small one, and not that the latter was a chapel added to the former. The style of the two buildings leads to the same conclusion, for in Sta. Catalina Ave have a small, low, vaulted church, two bays only in length and three in width. The two detached columns which carry the vaults are cylindrical, with capitals of somewhat the same kind as those in the church, but simpler and ruder. Recessed arches in the side walls contain various tombs of the Royal Family, who for ages, from the time of Fernando I. and Doña Sancha his queen, have been buried here; and the very circumstance that this little chapel was selected for the burial of so many royal persons, seems to make it extremely probable that it was the very chapel in which the body of San Isidoro had first been laid. The door of communication from the chapel to the church has an arch of the same kind as the transept arches, semi-circular and fringed with several cusps; and the chapel is now lighted by two open arches on the north side, which communicate with the cloister. The groining is all quadripartite, without ribs, but with plain bold transverse arches between the bays.