The church, as restored and added to after 1387, is regarded as consisting of a choir of four bays, with side aisles; a nave of five bays, also with side aisles; a central crossing, north and south transepts, and the five chapels just added south of the nave.[251] An open porch, to the south of these chapels, was also erected along with them, with a finely groined vault in the roof, and over it a small chamber, lighted by a picturesque oriel window, supported on a corbel, carved with an angel displaying the city arms.[252] The whole of the main divisions of the structure were vaulted, and the massive octagonal piers of the crossing were probably raised about this period.[253] The vaulting of the crossing, with its central opening, was executed about 1400.[254] The ancient Norman porch, forming the north entrance to the nave, was the only part of the twelfth century structure then preserved. The restoration seems to have continued from 1385 to 1416. Shortly after the erection of the five south chapels, another chapel, called the Albany Aisle, was built on the north side of the nave to the west of the old doorway. It opens from the nave with two arches, resting on a central pillar, and the roof is covered with groined vaulting in two bays.[255] On the pillar are sculptured the arms of the Duke of Albany and also those of the Earl of Douglas. Their names are often ominously found together in the history of the times, and both were accused of the murder of the Duke of Rothesay, heir to the throne. They were justly accused, and, although acquitted of the deed, the stain continues to rest on their memory. The chapels were either built to expiate their crime, or more probably to get a reputation for piety and obtain the favour of the Church.[256] Two other chapels were probably added to the north side of the nave about the same period; they were on the east side of the Norman doorway, and between it and the transept. One of them has disappeared, and the eastern one was dedicated to St. Eloi. The vaulting of the north aisle of the nave was necessarily rebuilt at the time when the north chapels were erected.[257]