This book argues that the poetry of César Vallejo announces the event, as a moment of irruption of a truth that destabilises the usual state of reality. It studies the emergence of a subject who affirms a truth that exceeds the law, interrupts hegemonic repetition, asserts universal solidarity, and defends "lost causes" despite political failure. The author reconfigures the traditional reading of Vallejo only as a poet of pain and human suffering, and offers new ways of understanding the relationship between poetry and politics.