We go to Spain for King Amadeo.
Actually Amadeo is of the Italian Royal Houses, but after the Spanish Revolution the powers that be decided to install him as their King, re-introducing the Monarchy to Spain.
He was ellected by The Court of Generals...which was basically a Spanish Parliament which was extremely partisan and extremely unstable. He lasted less then five years, probably because his major backers began to dissapear from the political scene, some were assasinated, some pushed out through corruption.
When The Government and the Military itself began to dissagree he basically told the whole sherbang where they could stick their throne and crown, abdicated, and went back to Italy