Leontiy Lyulye, an expert on conditions in the Caucasus, wrote in the mid-19th century: "Among the mountain people the blood feud is not an uncontrollable permanent feeling such as the vendetta is among the Corsicans. It is more like an obligation imposed by the public opinion." In the Dagestani aul Kadar, one such blood feud between two antagonistic clans lasted for nearly 260 years, from the 17th century till the 1860s.