was developed and expanded in three stages. In the second stage, when Hwangnyongsa Temple was located in the center, the region was developed into a grid network of road patterns with wide streets. One of the palace sites is marked by the artificial lake of Anapji with stone works of retaining walls delineating the former building location. The residential district of the nobles in the city was composed of great houses which were constructed conforming to the building code that granted privileges to the nobles, but forbidden to the commoners. Tiles from many ruins of the buildings were found everywhere. Of those that are still intact, show elegant and graceful design. Balhae (698–926) The composite nature of the northern Korean Kingdom of Balhae (698–926) art can be found in the two tombs of Balhae Princesses. Shown are some aristocrats, warriors, and musicians and maids of the Balhae people, who are depicted in the mural painting in the Tomb of Princess Jeonghyo, a daughter of King Mun (737-793), the third monarch of the kingdom. The murals displayed the image of the Balhae people in its completeness. The Mausoleum of Princess Jeonghyo (hangul: 정효공주묘, Chinese: Zhēnxiào Gōngzhǔ mù 贞孝公主墓), made in 793 by the people of the early Balhae kingdom, contains, among other things, the first complete discovered and detailed murals done by Balhae artists, and hence provides valuable insights to historians. The mausoleum originally had a funerary pagoda made from brick and stone slabs, in addition to a tumulus. Only the pagoda's foundations remain, which show that it was originally square, measuring 5.50x5.65 m. Below the funerary pagoda and tumulus, the princess' burial comprised an entry passage, tomb entrance, internal passage, and burial chamber. The burial chamber is underground, and was excavated in October 1980. The burial chamber measured 2.10x3.10 m and was built from bricks, with stone slabs forming the roof. The mounds of earth lined with stones demonstrate the continuance of Goguryeo-style tomb but the formal clothing shows Tang style, which implies that Korean Balhae actively accepted the Chinese Tang culture. There were originally 12 murals depicting people on the rear walls of the internal passage and north, east, and west walls of the burial chamber. The chamber is surrounded by four murals on each wall, depicting thirteen people in action, such as warriors (3), chamber attendants, musicians, and maids, wearing red, blue, yellow, purple, and brown robes. The