As the Prince Bishop lay asleep that night a mighty six-winged Angel stood beside him and bade him rise.  "Come," he said, "and I will show thee some of those who have worked with thee in building the great church, and whose service in God's eyes has been more worthy than thine."  And the Angel led him past the Cathedral and down the steep street of the ancient city, and though it was midday, the people going to and fro did not seem to see them.  Beyond the gates they followed the shelving road till they came to green level fields, and there in the middle of the road, between grassy banks covered white with cherry blossom, two great white oxen, yoked to a huge block of stone, stood resting before they began the toilsome ascent.