In 1931 , he published an investigation of Michael 's early career as titular Ban of Oltenia .
Some of Filitti 's biographical work was dedicated to the 16th - century Wallachian hero Michael the Brave .
In 1931 , Filitti published an investigation of Michael 's early career as titular Ban of Oltenia .
Some of Filitti 's biographical work was dedicated to the 16th - century Wallachian hero Michael the Brave .