Tang, Silla, and Balhae

Season 4, Episode 4: Tang, Silla, and Balhae
A painting of Empress Wu Zetian from the 1700s, creator unknown. Public domain
Some of the statues of Fengxian Cave, part of the Longmen Grottos which Empress Wu commissioned and supported. Source: G41rn8, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
Dae Joyeong, also remembered as King Go of Balhae. Public domain
A Stele from Balhae. Source: pressapochista (a flickr user), CC BY-SA 2.0 https://creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons