Your Favourite Diplomats

Could be. Anyone who negociates with foreign powers can be considered a diplomat.

He was originally a Chansellor though.

1)Bismarck

2)Talleyrand

3)Metternich

I vote for Siemion Woroncow (Russian ambassador in London in XVIII century). When in 1791 everything seemed that Great Britain with its allies (Prussia and Netherlands) would attack Russia, he managed to bribe members of English parlament (for example the leader of opposition Charles Fox) and English government. When the matter of war was put to the vote in parliament on 31 March 1791 it appeared that supporters of war had big advantage. But during decisive conference of English government at night there was a sensational disagreement between ministers that forced Prime Minister William Pitt Junior to send note to Berlin that cancelled attack of Tripple Alliance on Russia which seemed to be unavoidable. Some ministers that had supported the idea of war before during one night suddenly changed their opinions...

Siemion Woroncow bribed not only members of English government but also a lot of journalists that caused that public opinion did not support the idea of war. This action of Russian ambassador was brilliant. He saved his country from being overwhelmed by armies of Great Britain and Prussia (Russia was not able to fight in two parts of Europe - we must remember that it was fighting also against Turkey!). Unfortunately, it also meant that Poland lost maybe its last chance to liberate from influences of Russia by taking part in war as an ally of Great Britain and Prussia. Four years later it lost its independence.