The Treaty of the Three Black Eagles (because all three signatories used a black eagle as a state symbol, in contrast to the white eagle, a symbol of Poland

Coat of arms of Poland

The White Eagle is the national coat of arms of Poland. It is a stylized white eagle with a golden beak and talons, and wearing a golden crown, in a red shield.- Legal basis :...

) or the Treaty of Berlin

Berlin

Berlin is the capital city of Germany and is one of the 16 states of Germany. With a population of 3.45 million people, Berlin is Germany's largest city. It is the second most populous city proper and the seventh most populous urban area in the European Union...

(where it was signed by Prussia), was a secret treaty

Treaty

A treaty is an express agreement under international law entered into by actors in international law, namely sovereign states and international organizations. A treaty may also be known as an agreement, protocol, covenant, convention or exchange of letters, among other terms...

 between the Austrian Empire

Austrian Empire

The Austrian Empire was a modern era successor empire, which was centered on what is today's Austria and which officially lasted from 1804 to 1867. It was followed by the Empire of Austria-Hungary, whose proclamation was a diplomatic move that elevated Hungary's status within the Austrian Empire...

, the Russian Empire

Russian Empire

The Russian Empire was a state that existed from 1721 until the Russian Revolution of 1917. It was the successor to the Tsardom of Russia and the predecessor of the Soviet Union...

 and Prussia

Kingdom of Prussia

The Kingdom of Prussia was a German kingdom from 1701 to 1918. Until the defeat of Germany in World War I, it comprised almost two-thirds of the area of the German Empire...

. Signed between Russia and Austria on 13 September 1732 and joined by Prussia on 13 December that year, it concerned the joint policy of those three powers in regard to the succession of the Polish throne in light of the expected death of the Augustus II of Poland (of the Saxon House of Wettin) and the Polish custom of royal elections.