Lisbon Regicide led the ceremonies by placing flowers on the site where the assassination had taken place and celebrated a mass in their memory at the Church of São Vicente de Fora (where they are buried). During the centenary year many artistic, cultural, and historic events took place in honor of King Carlos I and the royal family, and several books on the subject were published. Lisbon Regicide The Lisbon Regicide () was the murder 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
Letters on a Regicide Peace of the country for the continuance of the war". The fourth letter, addressed to William Fitzwilliam, was written following Burke's reading of William Eden's "Some Remarks on the Apparent Circumstances of the War in the Fourth Week of October 1795". When Pitt's government tried to negotiate peace with France, Burke stopped composing the letter and instead published what became the first two letters, called "Two Letters on a Regicide Peace". Burke attempted to rewrite the letter to Fitzwilliam, but he did not finish before dying. The 1812 edition of his works did include a copy of the fourth letter that