What is Krvna osveta?

Krvna osveta is a law of vendetta among South Slavic peoples in Montenegro and Herzegovina that has been practiced by Montenegrins, Serbs, Bosniaks, and Croats throughout history. First recorded in medieval times, the feud is typically sparked by an offense such as murder, rape, assault, or similar wrongdoing. Associates or relatives of the victim, whether they are genuinely wronged or simply perceive it that way, are then prompted to fulfill the social obligation of avenging the victim. The revenge was seen as a way of maintaining one's honor, which was one of the most important aspects of traditional South Slavic culture.