In 1909, the fourth part of his chronicle, focusing on the civil wars among the Spanish conquerors, was published under the title Third Book of the Peruvian Civil Wars. The third part of Cieza de León's Crónicas del Perú, which examined the discovery and conquest of Peru by the Spaniards, was considered by historians to be lost. The document eventually turned up in a Vatican library, and historian Francesca Cantù published a Spanish version of the text in 1979.
In 1909, Cieza de León's chronicle included the fourth part, which focused on civil wars among Spanish conquerors. Historians believed that the third part of his work on the discovery and conquest of Peru by the Spaniards was lost. The document was later discovered in a Vatican library and published in Spanish by historian Francesca Cantù in 1979.