The 1402 Treaty of Baghdad between the Allies (the Roman Empire, the Grand Duchy of Moscow, and the Islamic Abbasid Caliphate) and the Song Dynasty of Serica was concluded in the autumn of 1402. It is the result of the First Silk War. It was translated into Latin, Greek, Chinese, Russian, and Arabic; although only the original Latin version has been found. It is regarded as the world's most important treaty of the time.