The abbey early became the occasional abode of the kings of Scotland, and James II. was born, crowned, married, and buried in it. The foundations of a palace apart from the abbey were laid in the time of James IV., Edinburgh having then become the acknowledged capital of the country. Holyrood Palace was henceforth the chief seat of the Scottish sovereigns. In it the nuptials of James IV. were celebrated; here also Mary Queen of Scots took up her abode in 1561 on her return from France, and here James VI. dwelt much before his accession to the throne of England in 1603. The abbey church was beautiful in its architecture and of great size. It consisted of nave, choir, transepts with aisles, and probably lady chapel to the east, two western towers, and a tower over the crossing; but of all that splendid structure there now only remain the ruins of the nave and one western tower. The surviving nave is in a ruinous state and consists of eight bays, the main piers of which are complete on the south side, but only represented by two fragments on the north side.[318] The vaulting of the south aisle still survives, but that of the north aisle is gone. The north wall of the aisle still stands, and the east and west ends of the nave are restored. The N.W. tower is still preserved, but the companion tower at the S.W. angle was demolished when the palace was rebuilt in the seventeenth century. Some remains of the cloister are still observable on the S. side of the nave. The chief part of the architecture is pronounced to be first pointed, but the doorway at the S.E. angle, which led from the cloister into the nave is pronounced to be of genuine though late Norman architecture. There was a nook shaft on either side, the divided cushion caps of which survive. The arch is round and contains two orders, both ornamented with zigzags. These orders are enclosed with a label, containing a double row of square facets and sinkings. Some alterations have taken place adjoining the doorway, and two of the windows, that over the doorway and that to the west of it, are circular-headed and have a Norman character in their nook shafts and cushion caps. These windows were probably constructed in imitation of Norman windows which existed there originally. It is not improbable that the choir was built before the nave, and was of Norman work, and this supposition is regarded as accounting for the Norman work found at the first bay of the nave, and which may have been erected in connection with the choir and crossing.