Efraín Trelles was born in 1953, in Andahuaylas. Historian trained in colonial history, graduated by the Pontifical Catholic University of Peru, with a thesis that became the classic: "Lucas Martínez Vegazo: operation of an initial Peruvian encomienda". He was one of the pioneers in introducing the analysis of data and computer models in his study on the loyalties of the kurakas in the Rebellion of Túpac Amaru II, which he published with Magnus Mörner in 1986.