 Pope Gregory XI styled Nerio as "lord of the town of Corinth" in a letter in November 1372, showing that the Pope regarded Nerio as the town's ruler.Nerio was one of the Christian leaders whom the Pope urged to make an alliance against the Ottoman Turks, but the Christian rulers' conflicts prevented them from attending a crusader congress at Thebes.Joan I of Naples, who inherited Achaea from Philip of Taranto in 1373, confirmed Nerio's possessions and titles in the principality.