Tadazane was the eldest son of Ijuin Tadamune. After his father was killed for conspiratorial actions in 1599, he was allowed to remain a Shimazu retainer owing to the intercession of Tokugawa Ieyasu. However, on a 10/2/1602 hunting expedition he was murdered, apparently on Shimazu Tadatsune's orders. A number of his close allies were afterwards put to death as well.
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005