Juan de Betanzos, Suma y narracion de los Incas (written 1551, printed Madrid 1880)

A history of the Incas written at Cuzco in 1551 by a Spaniard who had spent six years of his youth making a Quechua doctrina and two vocabularies, who married a sister of Atahuallpa, and who says in his dedication that Spanish accounts of Peru run far from what the Indians used, because the conquistadors were less employed in knowing the country than in subjecting it. It stayed unprinted for three hundred and twenty-nine years, and what reached print in 1880 is a fragment.