Count Sava Lukich Vladislavich-Raguzinsky was a Serbian merchant-adventurer and diplomat in the employ of Peter the Great. He conducted important diplomatic negotiations in Constantinople, Rome and Beijing. His most lasting achievement was the Treaty of Kiakhta, which regulated relations between the Russian Empire and the Qing Empire until the mid-19th century. He penned a number of pamphlets, monographs, treaties and letters concerned with liberating the lands of the Slavs, then occupied by the Ottoman Empire and the forces of Leopold I.

Gacko is a town and municipality in Republika Srpska, Bosnia and Herzegovina. It is situated in the region of East Herzegovina. As of 2013, the town has a population of 5,784 inhabitants, while the municipality has 8,990 inhabitants.