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 covered civil wars among Spanish conquerors. This section was titled "Third Book of the Peruvian Civil Wars." Historians believed that the third part of his work, examining the discovery and conquest of Peru by the Spaniards, had been lost. However, it was later discovered in a Vatican library and published in Spanish by historian Francesca Cantù in 1979.