- Born: 1576
- Died: 1638
- Sons: Shimazu Tadayuki
- Titles: Chûnagon, Satsuma no kami, Ôsumi no kami
- Other names: Iehisa, Matsudaira Iehisa
- Distinction: Lord of Satsuma, Ôsumi, and Hyûga
Tadatsune was the 3rd son of Shimazu Yoshihiro. He became the daimyô of the Shimazu following his family's involvement in the Sekigahara Campaign and went to Edo in 1603 to personally pledge his loyalty to Tokugawa Ieyasu. He received the character 'Ie' from Tokugawa Ieyasu and surname Matsudaira. He led troops at the Osaka Winter Campaign and was on his way to join the Osaka Summer Campaign with 13,000 troops but arrived after the castle had fallen. He won favor with the Tokugawa Bakufu in 1609 by sending an expedition to Okinawa that resulted in the king of that island being brought to Edo and tribute given. He received the title Chûnagon in 1626.
References
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005