Journey back through time at a special exhibition currently underway in Seoul and retrace the ancient history of two long-ago Korean kingdoms: Balhae (A.D. 698-926) and Goryeo (A.D. 918-1392).

Building materials used as part of a roof, called ‘wadang'(와당, 瓦當) in Korean, date back to Balhae times (A.D. 698-926).
Source: Exhibition traces history of Balhae, Goryeo :: KOREA.NET Mobile Site
Jan 25, 2016