Mohammad-Vali Khan, Khalatbari Tonekāboni ( Persian : محمدولی‌خان خلعتبری تنکابنی ; 1846 – 18 September 1926), also known as Sepahdar A'zam (سپهدار اعظم), was the leader of the constitutionalist revolutionary forces from Iran's northern provinces of Gilan and Mazandaran and known as one of the greatest statesmen and military commanders of Iranian history as well as its wealthiest nobleman.