Wrong Street.. World war 1..

It seems like you're referring to the assassination of Archduke Franz Ferdinand of Austria. This event occurred on June 28, 1914, in Sarajevo, Bosnia, and it is considered one of the catalysts for World War I. Franz Ferdinand, heir to the Austro-Hungarian throne, was assassinated along with his wife Sophie by Gavrilo Princip, a Bosnian Serb nationalist. The assassination triggered a chain of events that eventually led to the outbreak of World War I, as Austria-Hungary declared war on Serbia, leading to a series of alliances being invoked across Europe.