渤海國
(?
817年～
818年)
大明忠，是渤海國第八代君主，在位期間817年至818年，大言義的弟弟，改元為太始。818年
大明忠去世，謚號簡王。大祚榮王統從此斷絶，大祚榮之弟大野勃4世孫大仁秀繼位。
Great Ming-zhong, is eighth monarch Bohai Kingdom, during the reign of 817 years to 818 years, the big word meaning brother, reign title was too before. 818 death of the Great Ming-zhong, posthumous title of Wang Chien. Zuo-Rong Wang Tong large cut off from big brother Ono Bo Rong Zuo Shi Sun Daren 4 show the throne.