Injan

Injan (仁安) was the era name of Balhae King Mu (武王) and the first era name of Balhae. It was used for 19 years, from 719 to 737. According to the record in the New Book of Tang (《新唐書》), in 719 King Go (高王) died, and King Mu, who succeeded him, changed the era name to Injan. The exact period during which the Injan era name was used is not known, but it is generally understood as a single reign-single era system (一世一元).

Meanwhile, based on the record in the New Book of Tang, there is some speculation that era names may also have been used during the reign of King Go, but the exact era name is not known. The era name Cheontong (天統) appears as King Go's era name in the Dangi Gosa (《檀奇古史》), the Hwandan Gogi (《桓檀古記》), and the genealogy of the Tae clan (太氏) and others, but since these historical sources are mostly suspected to be forgeries, it is not recognized as an official era name of Balhae.