Yu Deukgong

Ryu Deuk-gong
Hangul	유득공
Hanja	柳得恭
Revised Romanization	Yu Deuk-gong
McCune–Reischauer	Ryu Tŭkkong

Yu Deuk-gong (1749–1807) was a Korean scholar during the Joseon Dynasty. He is remembered today for his work in recovering the history of Balhae, which had not generally been considered part of Korean history before his time.

...
Wikipedia