Wu (31 January 1367 – 23 January 1368) was the regnal year used by the Western Wu regime prior to Zhu Yuanzhang's establishment of the Ming dynasty. On New Year's Day of 1364 (Han Song Longfeng 10, Yuan Zhizheng 24), Zhu Yuanzhang proclaimed himself the King of Wu (吴王) in Yingtian Prefecture and established the Western Wu regime. He nominally respected the Han Song regime but suspended the Longfeng era name. In December 1366 (Han Song Longfeng 12, Yuan Zhizheng 26), Han Lin'er, emperor of Han Song, was drowned in a shipwreck while crossing the Yangtze River. Zhu Yuanzhang took the next year (1367) as Wu yuannian ("the first year of the Wu era" or "the first year of the King of Wu's reign" ). On 23 January 1368 (Wu 2, 4th day of the 1st month), Zhu Yuanzhang proclaimed himself emperor in Yingtian Prefecture, establishing the Ming dynasty with the era name "Hongwu". Later, Zhu Yihai's Jianguo Lu era imitated Zhu Yuanzhang's change of era without era name. Comparison table Other eras contemporaneous with Wu China Zhizheng (至正; 1341–1370): Yuan dynasty — era name of Emperor Shun of Yuan Kaixi (開熙; 1367–1371): Ming Xia — era name of Ming Sheng (明昇) Vietnam Đại Trị (大治; 1358–1369): Trần dynasty — era name of Trần Dụ Tông Japan Shōhei (正平; 1346–1370): Southern Court — era name of Emperor Go-Murakami and Emperor Chōkei Jōji (貞治; 1362–1368): Northern Court — era name of Emperor Go-Kōgon References Chinese imperial eras