
Determine the topic of the passage.
"On 28 June 1914, Archduke Franz Ferdinand of Austria , heir presumptive to the Austro-Hungarian throne, and his wife, Sophie, Duchess of Hohenberg , were shot dead in Sarajevo , by Gavrilo Princip , one of a group of six Bosnian Serb assassins coordinated by Danilo Ilić ."
Topic: