Lifespan: 15xx to 6/2 of Tenshō 10 (1582)
Father: Murai Sadakatsu
Siblings: Sadanari, Seiji, Jikōin (wife of Sassa Narimasa), sister (wife of Maeda Gen’i), sister (wife of Fukushima Takaharu)
Murai Seiji served as a bushō during the Azuchi-Momoyama period. He also had the name of Senji.
Seiji was born as the second son of Murai Sadakatsu, the Kyōto shoshidai, or official in charge of the Board of Retainers, an office in the Muromachi bakufu to guard the shōgun and give judgment on criminals in Kyōto for the Oda administration.
Seiji does not appear in historical records until the Honnō Temple Incident – the coup d’état against Oda Nobunaga on 6/2 of Tenshō 10 (1582), so the details of his life are uncertain. During the coup, Seiji rushed with his father and older brother, Murai Sadanari, to the Myōkaku Temple in support of Nobunaga’s eldest son and designated heir, Oda Nobutada. Seiji, along with his father and brother, was killed while fighting against the forces of Akechi Mitsuhide at the Nijō Castle in Kyōto.