King Mun (Dae Heum-mu)
Balhae's third king, who used the era name Daeheung, made peace with Tang, set up the Three Departments and Six Ministries, moved the capital to Sanggyeong and opened the Silla Road
He used the era names Daeheung and Boryeok, and Princess Jeonghyo’s epitaph calls him "Emperor." He set up three central chancelleries - Jeongdangseong, Seonjoseong and Jungdaeseong - and six ministries named after Confucian virtues (loyalty, benevolence, righteousness, wisdom, propriety and faithfulness); the Jeongdangseong’s chief minister directing the government and the virtue names were features unique to Balhae. He founded the Jujagam as the highest school. In letters to Japan he called himself "King of Goryeo (Goguryeo)," and in 762 Tang raised Balhae’s status from "prince of Bohai Commandery" to "king of Bohai."