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Đàng Ngoài was de-facto ruled by the Trịnh lords with the Lê emperors acting as titular rulers. The capital was Thăng Long (now Hanoi). Thăng Long was also known as Đông Kinh 東京, meaning "Eastern Capital", from which the common European name for Đàng Ngoài "Tonkin" originated. It was bordered by Đàng Trong (under the Nguyễn lords) along the Linh River (modern Gianh River in Quảng Bình Province). The name gradually fell into disuse after Nguyễn Huệ's conquest of the north.
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^Keith Weller Taylor, John K. Whitmore Essays Into Vietnamese Pasts 1995 Page 170 "The "kingdom of Cochinchina" was the polity of the Nguyễn lords (chúa), who had become the more and more independent rivals of the Trịnh lords of the north — if not of the Lê emperors whose affairs the Trịnh lords managed.."