In the early 19th century, Nikolai Demidov, a Ural breeder, acquired the tiny Principality of San Donato in the vicinity of Florence. Subsequently, one of the descendants of the Demidov family gave the same sonorous name to a small station near Nizhny Tagil. Film-essay about external and internal relations of peoples and times.

Nizhny Tagil resident Andrey Gagarin comes on vacation to his homeland in the Komi-Permyatsky district in the village of Bolshaya Kocha, where in the past he led the folklore group "Micha Asyv" ("Clear Morning"). He visits relatives and friends, together they perform folk songs and dances, talk about the national traditions of their small northern people. In addition, together with all his fellow villagers, Andrei takes part in "bull-killing", an ancient rite of sacrifice of a bull, unusual for modern times.