Diego Columbus, the only child of this marriage, was born in 1480.
Based on information acquired during his travels, and by reading and studying charts and maps, Christopher concluded that the earth was 25 percent smaller than was previously thought, and composed mostly of land. On the basis of these faulty beliefs, he decided that Asia could be reached quickly by sailing west. In 1484 he submitted his theories to John II, king of Portugal, petitioning him to finance a westward crossing of the Atlantic Ocean. His proposal was rejected by a royal maritime commission because of his miscalculations and because Portuguese ships were already rounding Africa.
Soon after, Columbus moved to Spain, where his plans won the support of several influential persons, and he secured an introduction, in 1486, to Isabella I, queen of Castile.
About this time, Columbus, then a widower, met Beatriz Enriquez, who became his mistress and the mother of his second son, Ferdinand Columbus. In Spain, as in Portugal, a royal commission rejected his plan. Columbus continued to seek support, however, and in April 1492 his persistence was rewarded: Ferdinand V, king of Castile, and Queen Isabella agreed to sponsor the expedition. The signed contract stipulated that Columbus was to become viceroy of all territories he located; other rewards included a hereditary peerage and one-tenth of all precious metals found within his jurisdiction.