The illegitimate son of Christopher Columbus, Hernando Colon, collected somewhere between fifteen and twenty thousand books over the course of his life in the 16th century and employed a group of scholars to create an index of all the works, Libro de los Epitomes. 14 of the 16 indexes survived in Seville, however, 2 remained missing. Until now, when 1 of the books was found at the University of Copenhagen.