* ''Distinction: Lord of [[Satsuma province|Satsuma]], [[Osumi province|Ôsumi]], and [[Hyuga province|Hyûga]]''
* ''Distinction: Lord of [[Satsuma province|Satsuma]], [[Osumi province|Ôsumi]], and [[Hyuga province|Hyûga]]''
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* ''Japanese'': [[島津]]忠恒 ''(Shimazu Tadatsune)''
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Tadatsune was the 3rd son of [[Shimazu Yoshihiro]]. He became the [[daimyo|daimyô]] of the [[Shimazu clan|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]].
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Tadatsune was the 3rd son of [[Shimazu Yoshihiro]]. He became the [[daimyo|daimyô]] of the [[Shimazu clan|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 [[kingdom of Ryukyu|Okinawa]] that resulted in the king of that island being brought to Edo and tribute given. He received the title Chûnagon in [[1626]].
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Tadatsune (now known as Iehisa) thus became the first [[Edo period]] lord of [[Satsuma han]]; he requested, and received, permission to [[Invasion of Ryukyu|invade the Ryûkyû Kingdom]], and did so in [[1609]].
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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 [[kingdom of Ryukyu|Okinawa]] that resulted in the king of that island being brought to Edo and tribute given. He received the title Chûnagon in [[1626]].