Both porch and chancel were built by Archbishop Dom Diego de Souza about the year 1530--a most remarkable date when the purely Gothic work here is compared with buildings further south, where Manoelino had already been succeeded by various forms of the classic renaissance. The porch stretches right across the west end of the church, and is of three bays. That in the centre, considerably wider than those at the side, is entered from the west by a round-headed arch, while the arches of the others are pointed. The bays are separated by buttresses of considerable projection, and all the arches, which have good late mouldings, are enriched with a fine feathering of cusps, which stands out well against the dark interior. Unfortunately the original parapet is gone, only the elaborate canopies of the niches, of which there are two to each bay, rise above the level of the flat paved roof. Inside there is a good vault with many well-moulded ribs, but the finest feature of it all is the wrought-iron railing which crosses each opening. This, almost the only piece of wrought-iron work worthy of notice in the whole country, is very like contemporary screens in Spain. It is made of upright bars, some larger, twisted from top to bottom, some smaller twisted at the top, and plain below, alternating with others plain above and twisted below. At the top runs a frieze of most elaborate hammered and pierced work--early renaissance in detail in the centre, Gothic in the side arches, above which comes in the centre a wonderful cresting. In the middle, over the gate which rises as high as the top of the cresting, is a large trefoil made of a flat hammered band intertwined with a similar band after the manner of a Manoelino doorway.[92] (Fig. 43.)