Metternich is the cliche answer.
He may be the Cliche answer, but he saw through some of the great minds of his time (Napoleon etc), and managed to use them to his gain. True he may have set up the stage for WWI, but then look at the state of Austria, Metternich restored its status as a power, about which Europe pivoted, and he did this for Austrias gain, not Europes. (kinda fell to pieces when he died of course)