Daye (era)

Daye (大業) was an era name of Emperor Yang (煬帝) of the Sui (隋) in China. It was used for 13 years and 3 months, from 605 to March 618. After the failed Goguryeo campaign in 613, rebellions broke out one after another in various regions, and numerous rebel forces adopted their own private era names. In November 617, Li Yuan (李淵) enthroned Emperor Gong (恭帝) at Chang'an, made Emperor Yang Grand Retired Emperor, and changed the era name to Yining (義寧). For this reason, the Zizhi Tongjian records Daye only up to the 12th year as the standard era name, and lists the years from 617 onward as the first year of Yining. However, Emperor Yang continued to reign at Jiangdu (江都), so the Daye era name was in fact used within Emperor Yang's domain until he was assassinated in March 618.

Other era names used during the same period include Yining (義寧: 617–618), used by Emperor Gong of Sui; Baekjo (白鳥), a private era name used by Xiang Haiming (向海明); Daese (大世), a private era name used by Liu Jialun (劉迦論); Changdal (昌達), a private era name used by the Chu (楚) regime of Zhu Can (朱粲); Taepyeong (太平), a private era name used by the Chu (楚) regime of Lin Shihong (林士弘); Siheung (始興), a private era name used by Cao Shiqi (操師乞); Jeongchuk (丁丑), a private era name used by the Xia (夏) regime of Dou Jiande (竇建德); Yeongpyeong (永平), a private era name used by the Wei (魏) regime of Li Mi (李密); Cheonheung (天興), a private era name used by Liu Wuzhou (劉武周); Yeongryung (永隆), a private era name used by the Liang (梁) regime of Liang Shidu (梁師都); Jeongpyeong (正平), a private era name used by Guo Zihe (郭子和); Jinheung (秦興), a private era name used by the Qin (秦) regime of Xue Ju (薛擧); (鳴鳳, or 鳳鳴), a private era name used by the Liang (梁) regime of Xiao Xian (蕭銑); and (通聖), a private era name used by Cao Wuche (曺武徹).