The Nanchao population was largely made up of ethnic Bazu(Bai) and Ni(Yi) along with many others which migrated to Rome's Magada vassal(~Bihar). By 1900(1147) Sinicans outnumbered Indians in Magada, and Magada was released as a vassal to become the seat of the Nanchao re-conquest of Sinica. Magada's numerous copper and iron mines were a great asset to the Nanchao. The Nanchao adopted Rome's practice of basing the year on the foundation of a city, they based it on the foundation of Xin Darlit(~Dali), founded in 1694(941), so the date 2193AUC would have been the year 499.