was a after Bunpō and before Genkō. This period spanned the period from April 1319 through February 1321. The reigning Emperor was .
Change of era
- 1319 : The new era name was created to mark the accession of Emperor Go-Daigo and the beginning of his reign. The previous era ended and the new one commenced in Bunpō 3. The era name was taken from the Old Book of Tang.
Events of the Gen'ō era
After the abdication of Emperor Hanazono in Bunpō 2, Takaharu-shinno was proclaimed emperor at the age of 31. Nijō Michihira was kampaku (chancellor); but the court remained under the direction of former-Emperor Go-Uda. Prince Morikuni was the shōgun in Kamakura; and the daimyō of Sagami, Hōjō Takatoki, was shikken or chief minister of the shogunate.
- 1319 (Gen'ō 1', 3rd month): Prince Kuniyoshi, the son of former-Emperor Go-Nijō, was declared Crown Prince (tōgu).
- 1330 (Gen'ō 2, 5th month): Hōjō Tokiasu, the kanrei in Kyoto, died at Rokuhara mansion, which was the stronghold of the Kamakura shogunate in the capital. Tokiasu's shogunate position was also known as Rokuhara Tandai and Kitakata.