Please answer the following question: Facts: - rrborn: dae won-yu - mrborn: tae won-yu - hanjaborn: - hangul: - mr: chong wang - rr: jeong wang - hangulborn: - hanja: Based on these bullet points, write a short biography describing the life of jeong of balhae .
Answer:
jeong of balhae -lrb- died 812 ? -rrb--lrb- r. 809 -- 812 ? -rrb-was the seventh king of balhae .he was the son of king gang .little is known of his reign , save that he chose the era name '' yeongdeok '' -lrb- , '' eternal virtue '' -rrb- .after his death , his brother succeeded him as king hui .