The Concepción massacre was an episode of the Paraguayan War where various Paraguayan families of Concepción's landowning classes were murdered between April and May 1869 under Paraguayan president Francisco Solano López's orders, ostensively to combat a conspiracy aimed at himself. Major José Gregório Benítez, known as Toro Pichai, famed as a torturer, was sent to the region to execute the task.