This peculiar position of the Jews in Spain and Portugal was also the cause of the immense number of conversions which gave these anti-Jewish nations a very large mixture of Jewish blood in their veins. The temptation to cling to the land and to the high social position which could not be enjoyed elsewhere was too strong for all but the strongest. Thus we find Marranos or secret Jews in all the higher walks of life in the times of the discovery of America. The more steadfast of their brethren who were equally prominent in the preceding period assisted in various ways earlier voyages of discovery, and even contributed indirectly to the success of the one great voyage, which did not begin until they were exiled from Spain forever. But we must constantly bear in mind, when speaking of the Middle Ages and of the two centuries succeeding it, the sixteenth and the seventeenth, that the Jews did not possess the right of citizenship and were not, even when they were treated very well, considered as an integral part of the population. This was the chief weakness of their position and the ultimate cause of all the persecutions, massacres and expulsions. Still they had many opportunities and made the most of them to advance their own interests and those of the countries in which they dwelt. We find them in the thirteenth and fourteenth centuries in close touch with the current of national life in the countries which were most absorbed in enterprises of navigation and discovery. Many of them were still great merchants, numerous others were scholars, mathematicians and astronomers or astrologers; some had influence in political life as advisers or fiscal officials at the royal courts. They accomplished much, as Jews and as Marranos, even when the danger of persecution must have been ever-present, or later, when in constant terror of the Inquisition. Many of them could therefore participate in the work which led to the discovery of a New World, where their descendants were destined to find a home safer and more free than was ever dreamt of in medieval Jewish philosophy. PART I. THE SPANISH AND PORTUGUESE PERIOD. CHAPTER I. THE PARTICIPATION OF JEWS IN THE DISCOVERY OF THE NEW WORLD.