On his return to Peru, Felipillo continued serving as a translator for the Spanish as the conquest of the country carried its course, although historians agree that the interpreting provided by Felipillo was far from faithful or even helpful for the Spanish. After Francisco Pizarro captured the Inca Atahualpa during the Battle of Cajamarca in 1532, Felipillo was the main translator for Pizarro and Atahualpa during their first meeting. Since Felipillo belonged to a rival tribe and was having an affair with one of Atahualpa's concubines, he deliberately translated Pizarro's messages in an inaccurate manner to the Inca king, and spread false rumours. Felipillo later betrayed Almagro during his expedition to Quito.