Answer:
The Concert of Europe during the Age of Metternich.
Step-by-step explanation:
The Concert of Europe was established by Metternich after the end of the French Revolution. With the end of the Napoleonic War, Europe was shattered into chaos, destruction and bloodshed. It needed a drastic revival.
In response to this, Austrian Prince Klemens von Metternich wanted to re-establish peace and progress in Europe. He wanted to bring an alliance between the European rulers. Therefore, he created the Concert of Europe on November 1815 to maintain a status quo in Europe. This alliance aimed at preserving the Vienna Settlement established after the end of the French Revolution and maintaining peace and friendship among the different rulers of Europe.
The European participation in the Greek Revolt was an attempt to establish the aims of the Concert of Europe. When Greek Civil war occurred during the 1820's, Europe rendered a great help to Greeks to establish full sovereignty. The European powers helped in the formation of a sovereign Greek state by mediating between the Turks and the Greeks. Thus, making the Concert of Europe a mediator of establishing peace and security in Europe.