Ijuin Tada'aki a retainer of the Japanese clan of Shimazu

Shimazu clan

The were the daimyō of the Satsuma han, which spread over Satsuma, Ōsumi and Hyūga provinces in Japan.The Shimazu were identified as one of the tozama or outsider daimyō clans in contrast with the fudai or insider clans which were hereditary vassals or allies of the Tokugawa clan,The Shimazu were...

 following the Sengoku period

Sengoku period

The or Warring States period in Japanese history was a time of social upheaval, political intrigue, and nearly constant military conflict that lasted roughly from the middle of the 15th century to the beginning of the 17th century. The name "Sengoku" was adopted by Japanese historians in reference...

 of the 16th century of Japan. Under Tada'aki, Ijuin clan would rise to the prominence as one of the most important retainer in the Shimazu clan

Shimazu clan

The were the daimyō of the Satsuma han, which spread over Satsuma, Ōsumi and Hyūga provinces in Japan.The Shimazu were identified as one of the tozama or outsider daimyō clans in contrast with the fudai or insider clans which were hereditary vassals or allies of the Tokugawa clan,The Shimazu were...

.

He served under Shimazu Tadayoshi

Shimazu Tadayoshi

was a daimyo of Satsuma Province during Japan's Sengoku period.He was born to a branch family of the Shimazu clan, the Mimasaka Shimazu family but after his father Shimazu Yoshihisa died, his mother married Shimazu Unkyu of another branch family, the Soshū...

 and Shimazu Takahisa

Shimazu Takahisa

, the son of Shimazu Tadayoshi, was a daimyo during Japan's Sengoku period. He was the fifteenth head of the Shimazu clan.On 1526, Takahisa was adopted as the successor to Shimazu Katsuhisa and became head of the clan. He launched a series of campaigns to reclaim three provinces: Satsuma, Osumi,...

 was essential in uniting Shimazu clan

Shimazu clan

The were the daimyō of the Satsuma han, which spread over Satsuma, Ōsumi and Hyūga provinces in Japan.The Shimazu were identified as one of the tozama or outsider daimyō clans in contrast with the fudai or insider clans which were hereditary vassals or allies of the Tokugawa clan,The Shimazu were...

, and battles against Ito clan

Ito clan

The ' were a Japanese clan that claimed descent from the medieval warrior Itō Suketoki , who was famous for his involvement in the incident involving the Soga brothers. The family became a moderate power both in influence and ability by the latter Sengoku Period of Feudal Japan...

 and Kimotsuki clan. At the siege of Iwatsurugi

Siege of Iwatsurugi

The Siege of Iwatsurugi was fought in the year of 1554. The siege was just one of a number of military actions that Shimazu Takahisa had to take against his rebellious kokujin vassals....

 in 1554, it was recorded that Tada'aki had his troop use matchlock guns against enemies for the first time by the Shimazu

Shimazu clan

The were the daimyō of the Satsuma han, which spread over Satsuma, Ōsumi and Hyūga provinces in Japan.The Shimazu were identified as one of the tozama or outsider daimyō clans in contrast with the fudai or insider clans which were hereditary vassals or allies of the Tokugawa clan,The Shimazu were...

 army. For this and other contributions and services, he held the post of the top karo

KARO

KARO is a radio station licensed to serve Nyssa, Oregon, USA. The station is owned by the Educational Media Foundation.It broadcasts a Contemporary Christian music format as part of the Air 1 network.-History:...

 until 1556 and governed as the top official of the clan.

It is recorded that on 1561 while having a party with Kimotsuki Kanetsugu

Kimotsuki Kanetsugu

was the sixteenth head of the Kimotsuki family and the son of Kimotsuki Kaneoki. Kanetsugu was a skilled and smart leader but his domain happened to be next to that of the most powerful clan in Kyūshū, Shimazu clan and Kimotsuki family would be crushed by them....

, Tada'aki offended Kanetsugu so well that humiliated Kanetsugu started a war that the Shimazu clan

Shimazu clan

The were the daimyō of the Satsuma han, which spread over Satsuma, Ōsumi and Hyūga provinces in Japan.The Shimazu were identified as one of the tozama or outsider daimyō clans in contrast with the fudai or insider clans which were hereditary vassals or allies of the Tokugawa clan,The Shimazu were...

wanted all along.