The centre round which all these manifold buildings and offices were ranged was, of course, the cathedral. Wherever available space and the nature of the ground permitted it, the cloister and chief buildings were placed under the shelter of the church on its southern side, as may be seen, for instance, at Westminster, where the cloisters, chapter house, deanery, refectory (now the College Hall), etc., are all gathered on the south side of the Abbey. At Canterbury, however, the builders were not able to follow the usual practice, owing to the fact that they were hemmed in closely by the houses of the city on the south side, so that we find that the space between the north side of the cathedral and the city wall, all of which belonged to the monks, was the site of the monastic buildings. The whole group formed by the cathedral and the subsidiary buildings was girt by a massive wall, which was restored and made more effective as a defence by Lanfranc. It is probable that some of the remains of this wall, which still survive, may be considered as dating from his time. The chief gate, both in ancient and modern days, is Prior Goldstone's Gate, usually known as #Christ Church Gate#, an exceedingly good example of the later Perpendicular style. A contemporary inscription tells us that it was built in 1517. It stands at the end of Mercery Lane, a lofty building with towers at its corners, and two storeys above the archway. In front there is a central niche, in which an image of our Saviour originally stood, while below a row of shields, much battered and weather-beaten, display armorial bearings, doubtless those of pious contributors to the cost of the building. An early work of Turner's has preserved the corner pinnacles which once decorated the top of the gate; these were removed some thirty years ago. [Illustration: THE SOUTH-WEST PORCH OF THE CATHEDRAL.] [Illustration: CLOISTERS OF THE MONKS' INFIRMARY.]