In 1071 Jan collected a tribute for Sviatoslav Yaroslavich in the Rostov land. At that time he suppressed a rebellion in Belozero, caused by crop failure and famine. The two wise men who led the rebels lied to the inhabitants, saying that in a famine year the women hid their fat, honey, fish, etc.; Jan talked to the wise men, and then marched upon them with weapons, and they fled into the woods after the fight. Later they were turned out and executed. To do it Jan had to threaten the White Guards that he and his troops would have to stay with them for a year.
In the year 1093 Yan Vyshatich went upon the Cumans with Monomakh, and in 1106 together with his brother Putyata he beat them near Zarechsk and "took their plunder". Chronicles and the Pechersk Paterikon eulogize the virtues of Yan Vyshatich and his wife Maria, who loved the Monk Theodosii, who conversed with them about alms-giving, about the kingdom of heaven and the hour of death.
