 In 1541–1542, Hasan Beg accompanied King Tahmasp I (1524–1576) on an expedition to Dezful, and from then he "was with the royal camp in all its journeys, and saw most events with his own eyes, thus becoming an eyewitness to most of the subsequent military events that he described".In 1546–1547, some five years after the Dezful campaign, Hasan Beg fought in Tahmasp I's Georgian campaigns.The last military episode in which Hasan Beg reports his own involvement was Tahmasp I's battle against the Ardalan Kurds in 1550.