York is situated on the higher ground, in the angle made by the rivers Ouse and Foss at their junction; a little to the south, the east and the west there are low ridges of mound. The outer, main series of hills which border the central plain, are some dozen miles away, their outer faces being more or less parallel and running very roughly north and south. It seems clear that the site was chosen from the first for its immediate defensive value, the direct result of its geographical features. The position was of both tactical and strategic importance. In Roman times, however, its tactical value decreased when the great wall was built that stretched with its lines of mound, ditch, stone-rampart, and road, and its series of camps and forts, from near the mouth of the Tyne to Solway Firth. Henceforth the wall marked the debatable frontier, but York never lost its strategic value. It was thus used by the Romans, William I., Edward I., Edward II., and Edward III. in their occupation of and their expeditions against the North. It has served as a base depôt and military headquarters for centuries. C. POLITICAL IMPORTANCE York, then, whatever its name (for it had many names) or condition, inevitably became an occupied place, a stronghold or a town from earliest times. When the Church attained great importance in the north, York, in addition to its natural and military values became, in 735, an ecclesiastical metropolis, for from this date the Archbishop of York was not only the ruler of the diocese of York, but in addition spiritual head of the Church in the North of England. Further, there were established in the city branches of the civil government. Business of the state, both civil and military, and of the Church was regularly conducted at York from early times. This political importance lasted long and is intimately connected with many events in the city's history. The fort and military defences were renewed from time to time, and staff-work and general administration, whether Roman or Edwardian, were conducted from York. The king, from whom York was rented by the citizens, had his official representatives with their offices permanently established here. The siege of 1644 after the royalist defeat at Marston Moor, was due mainly to the political importance of the city. In Danish times there were kings of York. The Archbishops, besides owning large areas of land in and around the city, had their palace in the city. Monasteries grew up and flourished till the Dissolution; churches and other religious buildings were everywhere. Further, from century to century, York was the home of important nobles of the realm. This political importance has persisted through the centuries. York still claims its traditional rank of second city in the kingdom. CHAPTER III APPEARANCE A. GENERAL APPEARANCE