In 1906 Mateu Morral threw a bomb concealed as a bouquet from his hotel window at the King of Spain, Alfonso XIII, and his bride Victoria Eugenie as the wedding procession moved along the Calle Mayor in Madrid, Spain.
25 people were killed and over a hundred injured. After he was captured he killed his guard and then killed himself.
Fast forward about 30 years :
During the Spanish Civil War, Calle Mayor was renamed Calle Mateo Morral by the Republican Madrid council.