 Ecumenical Patriarch Joseph II of Constantinople may also have been an illegitimate half-brother of Fruzhin's.Probably in 1404, Fruzhin headed an anti-Ottoman revolt in the Bulgarian lands along with his cousin Constantine II, Ivan Sracimir's son and last reigning Bulgarian monarch at Vidin.Despite conflicting historical details regarding the span and size of the revolt, there are hints that Constantine and Fruzhin managed to restore their rule over at least a part of the Bulgarian lands.