In 1347 Edward made a short truce with King Philip: even after his late victories he felt his strength much strained, his treasury being empty, and his army exhausted by the year-long siege of Calais. But he would have returned to the struggle without delay had it not been for the dreadful calamity of the "Black Death," which fell upon France and England, as upon all Europe, in the years 1348-1349. The disease, on which the 14th century bestowed this name, was the bubonic plague, still familiar in the East. After devastating western Asia, it reached the Mediterranean ports of Europe in 1347, and spread across the continent in a few months. It was said that in France, Italy and England a third of the population perished, and though this estimate may be somewhat exaggerated, local records of unimpeachable accuracy show that it cannot be very far from the truth. The bishop's registers of the diocese of Norwich show that many parishes had three and some four successive vicars admitted in eighteen months. In the manor rolls it is not uncommon to find whole families swept away, so that no heir can be detected to their holdings. Among the monastic orders, whose crowded common life seems to have been particularly favourable to the spread of the plague, there were cases where a whole community, from the abbot down to the novices, perished. The upper classes are said to have suffered less than the poor; but the king's daughter Joan and two archbishops of Canterbury were among the victims. The long continuance of the visitation, which as a rule took six or nine months to work out its virulence in any particular spot, seems to have cowed and demoralized society. Though it first spread from the ports of Bristol and Weymouth in the summer of 1348, it had not finished its destruction in northern England till 1350, and only spread into Scotland in the summer of that year. Economic and social effects of the Black Death.