A revolt starts when the conqueror of Chile, Pedro de Valdivia is captured and killed by Mapuche (also known as Araucanian) Indians. Ercilla blames Valdivia for his own death, having mistreated the natives who had previously acquiesced to Spanish rule and provoking them into rebellion. However, having previously accepted the rule of Charles V, Holy Roman Emperor, the Araucanians were now in revolt against their legitimate sovereign lord. This is the ethical position of Ercilla: sympathy for the Indians' suffering, admiration for the courage of their resistance, criticism of Spanish cruelty, but loyalty to and acceptance of the legitimacy of the Spanish cause (the legitimate rule of a duly-constituted prince and the extension of Christianity). Although Ercilla's purpose was to glorify Spanish arms, the figures of Araucanian chiefs, the strong Caupolicán, the brilliant Lautaro, the old and wise Colocolo and the proud Galvarino, have proved the most memorable.