Alrude, Countess of Bertinoro was a 12th century Italian noblewoman who, in 1172, ended the siege of Aucona. "Aucona" is likely to have been a reference to the city of Ancona, now in the Marche region of Italy. According to a historical account written some time after the siege, Alrude led an army into battle and dealt a crushing blow to imperial troops under Frederick I, Holy Roman Emperor.