In Belgrade, in 1690 Patriarch Arsenije III Čarnojević received a "Letter of Invitation" from Leopold I to come under his protection in return for the Serbs to stay on their land and give, "according to their circumstances, the necessary food, and other supplies to the Imperial armies on the battlefield."

[2] Unfortunately, the Imperial invitation arrived three months after it was written, raising the possibility of an exodus of the Serbian population from Old Serbia, now that the balance of power tipped to the Turkish side.

After lengthy discussions, the people decided to accept the Emperor's offer of protection and Isaija Đaković was named chief negotiator in the upcoming Vienna talks.

[2] Since the letter didn't address the current Serbian population living in Austria and Hungary from the time of the Middle Ages, therefore, how could the new wave of Serb settlers hope to plant their roots without guarantees?

[5] Together Bishop Isaija and Count Branković drafted specific demands as supplements to the privileges for the upcoming Belgrade Assembly (18 June 1690) and on 21 August 1690, Patriarch Arsenije received from the Emperor 'Privileges' with a new text that he had requested in the name of his people.

In the 'Privileges' Serbs were a recognized nation in the Habsburg Monarchy, giving them religious and political guarantees on the condition that they remain loyal to the crown and defend the empire.