Guan Yu[a] was a Chinese general serving under the warlord Liu Bei in the 3rd century AD. He features as a major character in the novel Romance of the Three Kingdoms. He has since been deified.
Originally Guan Yu of the Three Kingdoms period, he was deified and worshipped as a war god.
Guan Yu fought alongside his blood brothers Liu Bei and Zhang Fei, helping construct the state of Shu until he died as a result of a ploy by the two rival states, Wu and Wei. Several hundred years after his death, he appeared to Master Zhiyi at Yuquan Hill, from whom he learned to be a guardian and fend off evil spirits.
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Trivia
In Shin Megami Tensei: Devil Summoner, despite not being a summonable demon, the boss version of Guandi Shengjun has a Calm (ID 7) personality assigned rather than the usual Vigorous (ID 0) personality assigned to bosses.
Nomenclature
The name Kanteiseikun is the Japanese reading of a term used to refer to the deified Guan Yu in Taoism.
According to Kazuma Kaneko Works IV, Guan Yu is known as Kantei Seikun in Devil Summoner rather than Kansei Teikun due to confusion with demons such as Hokuto Seikun.[1]