via VNA/Vietnam Plus, 14 May 2023: Photo story on the Hue Citadel.
Within nearly 400 years (1558-1945), Hue was successively the Capital city under 9 reigns of Nguyen Lords in Dang Trong, the Capital city of Tay Son Dynasty and then the Capital of the united country under the reign of 13 Emperors of Nguyen Dynasty.
Source: Hue Citadel: A Journey Back in Time | Tours | Vietnam+ (VietnamPlus)