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King Henry of Trastámara becomes King Henry II (Enrique II) of Castile and Leon on March 23, 1369, after defeating and murdering his half-brother, King Peter, at the Battle of Campo de Montiel earlier that month on March 14.
.Following the battle, King Peter was lured into a trap and killed by Henry himself marking the definitive start of Henry's second and undisputed reign. Although Henry had previously been crowned in 1366 during a brief usurpation, his permanent reign as the first monarch of the House of Trastámara is officially dated from his1369 victory at the Battle of Campo de Montiel
