The article presents for the first time the biography of the Saratov voivode Ivan Ivanovich Kosagov, the father of the famous General Grigory Kosagov. I. I. Kosagov began his service at the court of Tsar Mikhail Romanov in 1620 at the age of 17, and before that he served with the patriarch for several years, like many of his ancestors. Becoming a Moscow nobleman in 1631, he received his first appointmenttothe voivodeship in Yuriev-Polsky,thenmainly served onthe southern borders. It is said about his regimental service in Mtsensk, Lomov, Tula.
