 Fruzhin visited the Republic of Ragusa (Dubrovnik) and the leaders of the Albanian revolt in 1435 as a diplomat of Sigismund.In 1444, he participated in Władysław III of Poland's Crusade of Varna, an attempt to drive the Ottoman Turks away from Bulgaria and Europe.The campaign ended in disaster, as Władysław III died in the Battle of Varna at the Black Sea, and Fruzhin is not mentioned in any later historical sources.