It was, however, in the valley of the Thames that English town-life was growing up most vigorously. Tried by the test of statistics, indeed, Oxford was still but a small place; in the time of the Confessor it had only contained about a thousand dwellings, and before the Domesday survey was made the town had, through some unexplained cause, suffered such decay that more than half of these were waste.[111] But the “waste” was quickly repaired under the wise government of Robert of Oilly, to whom the chief command at Oxford was entrusted by the Conqueror, and of his nephew and namesake who succeeded to his office. Before the close of Henry’s reign every side of that marvellously varied life of Oxford which makes its history seem like an epitome of the history of all England was already in existence, though only in germ. The military capabilities of the site, recognized long ago by Eadward the Elder, had been carefully strengthened; within the natural protection of its encircling rivers, the town was “closely girt about with rampart and ditch,”[112] and the mound, raised probably by Eadward himself, at its western end had been made the nucleus of a mighty fortress which was soon to become famous in the struggle of Stephen and Matilda.[113] Nor was fortification the sole care of the D’Oillys; within and without the city, works of piety and of public utility sprang up under their direction. The ancient ford which had given the town a name was no longer the sole means of crossing the network of streams which fenced it in on every side save one; the High Bridge of our own day represents one built by the first Robert of Oilly.[114] Of the sixteen churches and chapels which Oxford now contained,[115] S. George’s-in-the-Castle was certainly and S. Peter’s-in-the-East probably founded by him;[116] several of the older parish churches which had fallen into decay were restored at his expense;[117] and those of S. Michael and S. Mary the Virgin, as well as that of S. Mary Magdalene without the walls, were all founded in his time or in that of his nephew, if not actually by their munificence.[118] One of these, S. Mary the Virgin, was to become famous in after-days as the University church. As yet, the centre of intellectual life at Oxford was the ancient monastery of S. Fritheswith or Frideswide, which after many vicissitudes had finally passed into the hands of the Austin canons,[119] and entered upon a new career of prosperity under its learned prior Guimund, the builder of the beautiful church which now stands hidden away beneath the later splendours of Christ Church, like a buried and yet living relic of an earlier and simpler age. Even S. Frideswide’s, however, had a formidable rival in the priory of Oseney which the younger Robert of Oilly founded, also for Austin canons, in the island-meadow overlooked by his castle-tower.[120] The Augustinians were a new order whose rise was closely associated with the revival of