Silhak scholar, author of Balhaego and Gyujanggak kumseogwan
| Life | 1748 ~ 1807 |
| Era | 조선 후기 |
| Clan | 문화 류씨 |
Ryu Deuk-gong, pen name Yeongjae, served as a Gyujanggak kumseogwan and is known for Balhaego, which treats Balhae as part of Korean history. He belongs to the (Jungmun) Jihusa-gong branch.