In this final adoption of the renaissance he was soon followed by many others, even before he laid down his charge at Thomar in 1551.
In most of these buildings, however, it is not so much his work at Thomar which is followed—except in the case of cloisters—but rather the chapel of the Conceição, also at Thomar. Like it they are free from the more exuberant details so common in France and in Spain, and yet they cannot be called Italian.
Thomar, Conceição.
There is unfortunately no proof that the Conceição chapel is João's work; indeed the date inscribed inside is 1572, twenty-one years after his retirement, and nineteen after his death. Still this date is probably a mistake, and some of the detail is so like what is found in the great convent on the hill above that probably it was really designed by him.
This small chapel stands on a projecting spur of the hill half-way down between the convent and the town.
Inside the whole building is about sixty feet long by thirty wide, and consists of a nave with aisles about thirty feet long, a transept the width of the central aisle but barely projecting beyond the walls, a square choir with a chapel on each side, followed by an apse; east of the north choir chapel is a small sacristy, and east of the south a newel-less stair—like that in the Claustro de Sta. Barbara—leading up to the roof and down to some vestries under the choir. Owing to the sacristy and stair the eastern part of the chancel, which is rather narrower than the nave, is square, showing outside no signs of the apse.
The outside is very plain: Ionic pilasters at the angles support a simple cornice which runs round the whole building; the west end and transepts have pediments with small semicircular windows. The tile roofs are surmounted by a low square tower crowned by a flat plastered dome at the crossing and by the domed stair turret at the south-east corner. The west door is plain with a simple architrave. The square-headed windows have a deep splay—the wall being very thick—their architraves as well as their cornices and pediments rest on small brackets set not at right angles with the wall, but crooked so as to give an appearance of false perspective.
The inside is very much more pleasing, indeed it is one of the most beautiful interiors to be found anywhere. ([Fig. 88].)
On each side of the central aisle there are three Corinthian columns, with very correct proportions, and exquisite capitals, beautifully carved if not quite orthodox. Corresponding pilasters stand against the walls, as well as at the entrance to the choir, and at the beginning of the apse. These and the columns support a beautifully modelled entablature, enriched only with a dentil course. Central aisle, transepts and choir are all roofed with a larger and the side aisles with a smaller barrel vault, divided into bays by shallow arches. In choir and transepts the vault is coffered, but in the nave each bay is ornamented with three sets of four square panels, set in the shape of a cross, each panel having in it another panel set diagonally to form a diamond. At the crossing, which is crowned by a square coffered dome, the spandrils are filled with curious winged heads, while the semi-dome of the apse is covered with narrow ribs. The windows are exactly like those outside, but the west door has over it a very refined though plain pediment.
So far, beyond the great refinement of the details, there has been nothing very characteristic of João de Castilho, but when we find that the pilasters of the choir and apse, as well as the choir and transept arches, are panelled in that very curious way—with strips crossing each other at long intervals to form diamonds—which João employed in the passage arches in the Thomar dormitory and in the loggia at Batalha, it would be natural enough to conclude that this chapel is his work, and indeed the best example of what he could do with classic details.