spring. In the four corners the space between the columns, as well as the entablature, is set diagonally, leaving room in one instance for a circular stair. The cornice is enriched with dentils and the frieze with raised squares. On the entablature more columns of about the same height as those below, but with Ionic capitals, stand in pairs. Stairs lead up in each corner to the flat roof, above which they rise in a short dome-bearing drum. In this upper cloister the arches are much narrower, springing from square Ionic pilasters, two on each side, set one behind the other, and leaving an open space beyond so that the whole takes the form of a Venetian window. The small upper window between the columns is round instead of square, and the cornice is carried on large corbels. In front of all the openings is a balustrade. Two windows look south down the hillside over rich orchards and gardens, while immediately below them a water channel, the end of a great aqueduct built under Philip I. of Portugal, II. of Spain, by the Italian Filippo Terzi,[160] cools the air, and, overflowing, clothes the arches with maidenhair fern. Another window opening on to the Claustro de Sta. Barbara gives a very good view of the curious west front of the church. There is not and there probably never was any parapet to the flat paved roof, from where one can look down on the surrounding cloisters, and on the paved terrace before the church door where Philip was elected king in April 1580. (Fig. 92.) This cloister, the first example in Portugal of the matured Italian renaissance, is also, with the exception of the church of São Vicente de Fora at Lisbon, the most successful, for all is well proportioned, and shows that Diogo de Torralva really understood classic detail and how to use it. He was much less successful in the chancel of Belem, while about the cathedral which he built at Miranda de Douro it is difficult to find out anything, so remote and inaccessible is it, except that it stands magnificently on a high rock above the river.[161] The reigns of Dom Sebastião and of his grand-uncle, the Cardinal-King, were noted for no great activity in building. Only at Evora, where he so long filled the position of archbishop before succeeding to the throne, was the cardinal able to do much. The most important architectural event in Dom Sebastião's reign was the coming of Filippo Terzi from Italy to build São Roque, the church of the Jesuits in Lisbon, and the consequent school of architects, the Alvares, Tinouco, Turianno, and others who were so active during the reign of Philip. But before speaking of the work of this school some of Cardinal Henry's buildings at Evora must be mentioned, and then the story told of how Philip succeeded in uniting the whole Peninsula under his rule. [Sidenote: Evora, Graça.]