يوحنا الثامن
Piracy was also a big concern for the Pope. Domagoj was accused of attacking a ship which was bringing home the papal legates who had participated in the Eighth Catholic Ecumenical Council. In 874, Pope John VIII intervened by requesting Duke Domagoj as a Christian to restrain the pirates who were in his name ravaging the Adriatic assaulting Christian sailors and that exile would be a more suitable punishment for the rebels instead of death penalties, but his request wasn't successful. Pope John VIII referred to Domagoj in letters as "Duke Domagoj the Famous" (), but also wrote that he won't find Domagoj innocent if piracy was not dealt with.