This hunk, Gavrilo Princip, is known as the man who assassinated Franz Ferdinand, becoming the trigger that pulled the already-loaded gun of WWI.
Terrible, right? Depends on who you ask. Though Franz Ferdinand and his wife Sophie had not personally wronged Princip, they were the heirs of Franz Joseph, the Austro-Hungarian monarch who had rulled for decades with an iron fist, and did not allow the Slavic majority in the balkin peninsula many rights or any say in how they were to be governed.
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A Yugoslav nationalist movement had been stirring. Young Bosnia, of which Gavrilo Princip was an involved member, was a group of radical youth who wished to unite all Yugoslavs, forming a nation independent of Austria-Hungary and free from the tyrant hand of Franz Joseph.
When Franz Ferdinand made it clear that he intended to rule the Serbs more liberally, Princip and Young Bosnia feared that their movement would lose momentum. Something had to be done. The Black Hand was formed; a no-nonsense group who’s emblem consisted of a vial of poison, a daggar, a bomb, and flag featuring the skull & crossbones.
Gavrilo Princip, a tragically passionate nationalist, shot & killed Franz Ferdinand and his newlywed wife Sophie in Sarajevo on June 28, 1914.
Here he is on trial, seated in the middle of the front row.

He died in prison on April 28, 1918.