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The Lisbon Regicide or Regicide of 1908 () was the assassination of King Carlos I of Portugal and the Algarves and his heir-apparent, Luís Filipe, Prince Royal of Portugal, by assassins sympathetic to Republican interests and aided by elements within the Portuguese Carbonária, disenchanted politicians and anti-monarchists. The events occurred on 1 February 1908 at the Praça do Comércio along the banks of the Tagus River in Lisbon, commonly referred to by its antiquated name "Terreiro do Paço".