The archives are rich with autograph material from the first of the Conquistadores to the end of the 19th century. Here are Miguel de Cervantes' request for an official post, the Bull of Demarcation Inter caetera of Pope Alexander VI that divided the world between Spain and Portugal, the journal of Christopher Columbus, maps and plans of the colonial American cities, in addition to the ordinary archives that reveal the month-to-month workings of the whole vast colonial machinery, which have been mined by many historians in the last two centuries.