Then came a period of immense prosperity through commerce, through economies in government, through the improvement of agriculture and the opening of mines. This girl queen, without intrigue, without descending from her native nobility to peep and whisper with shady diplomats, showed herself in reality a great monarch, a true Semiramis of the north, more worthy of respect and reverence than Elizabeth of England. She was highly trained in many arts. She was fond of study, spoke Latin fluently, and could argue with Salmasius, Descartes, and other accomplished scholars without showing any inferiority to them. She gathered at her court distinguished persons from all countries. She repelled those who sought her hand, and she was pure and truthful and worthy of all men's admiration. Had she died at this time history would rank her with the greatest of women sovereigns. Naude, the librarian of Cardinal Mazarin, wrote of her to the scientist Gassendi in these words: To say truth, I am sometimes afraid lest the common saying should be verified in her, that short is the life and rare the old age of those who surpass the common limits. Do not imagine that she is learned only in books, for she is equally so in painting, architecture, sculpture, medals, antiquities, and all curiosities. There is not a cunning workman in these arts but she has him fetched. There are as good workers in wax and in enamel, engravers, singers, players, dancers here as will be found anywhere. She has a gallery of statues, bronze and marble, medals of gold, silver, and bronze, pieces of ivory, amber, coral, worked crystal, steel mirrors, clocks and tables, bas-reliefs and other things of the kind; richer I have never seen even in Italy; finally, a great quantity of pictures. In short, her mind is open to all impressions. But after she began to make her court a sort of home for art and letters it ceased to be the sort of court that Sweden was prepared for. Christina's subjects were still rude and lacking in accomplishments; therefore she had to summon men of genius from other countries, especially from France and Italy. Many of these were illustrious artists or scholars, but among them were also some who used their mental gifts for harm. Among these latter was a French physician named Bourdelot--a man of keen intellect, of winning manners, and of a profound cynicism, which was not apparent on the surface, but the effect of which last lasting. To Bourdelot we must chiefly ascribe the mysterious change which gradually came over Queen Christina. With his associates he taught her a distaste for the simple and healthy life that she had been accustomed to lead. She ceased to think of the welfare of the state and began to look down with scorn upon her unsophisticated Swedes. Foreign luxury displayed itself at Stockholm, and her palaces overflowed with beautiful things.