After the victory over the twelve self-appointed governors ruling chaotic Annam and the Later Ngo kings, Dinh Bo Linh proclaimed himself ‘Emperor Dinh Tien Hoang’, established his capital at Hoa Lu and renamed the country Dai Co Viet in the year of 968. He was the first Emperor to cast Vietnamese coins ‘Thai Binh Hung Bao’ in Viet Nam history and opened an independent era from China for Viet Nam.
The round copper coin had 4 Chinese characters ‘Dai Binh Hung Bao’ with a squared hole. The average of its diameter was about 23.87 mm and its weight was about 2.3 gram. In ancient time, the characters THAI (great) or DAI (big) had the similar meaning. On the reverse side of the coin, there was a character DINH either above or below the hole. We could find some coins with the hook of character DINH toward the left side, instead of the normal right side. Also there were Thai Binh Hung Bao with a plain reverse. The author of the book Vietnamese Historical Currency published by Yunnan and GuangXi Numismatic Society in 1993 thought that the ones with plain reverse were cast by Emperor Le Dai Hanh in the first year (980-1005) of the Le dynasty.