Since the time of the church schism, Old Believers Kerzhaks have lived on the Salt Trail. The secular authorities did not recognize, did not participate in the census, did not have passports. And strangers were not allowed to visit them - first of all, scientists were shunned, and they equipped expedition after expedition to the Kerzhatsky taiga village. Only one of the researchers smiled luck: the historian Yuri Kosmach learned about the life of the descendants of the boyar clans who survived during the split, and about the liberum, and about the Sonorets elders.