The feud between the Hatfields and McCoys is legendary, but Appalachian feuds like theirs followed a long-standing pattern—and some fatal family feuds continue today. Across centuries and continents, isolated communities, kinship groups and ambitious dynasties have built social systems around honor, retribution and the preservation of family pride. Here’s a look at some of the most infamous family feuds from around the world and the centuries-old traditions that drove them.