 Its name, which disappeared during the period of Ottoman rule, was revived in the 19th century.Its boundaries, which have changed considerably over the time, also came to be redefined during the same period.The document was addressed to the Secretary of State for Foreign Affairs of the United Kingdom, Edward Grey, the ambassadors in the palace in London and the Minister of Foreign Affairs of the Russian Empire and was signed by Dimitrija Čupovski, Alexander Vezenkov, Gavril Konstantinovich and Nace Dimov.