History
The Tachibana clan (立花氏) was a Japanese clan of daimyo during the Sengoku period and the Edo periods. They were originally based in Tachibana castle in Kyūshū, but at the time of the Edo period, the family's holdings were moved to the Yanagawa Domain in the far north-east of Honshū.
The clan was created by a warrior known as Ōtomo Sadatoshi (died 1336). Even though they did not descend from any one from the Tachibana clan of the Heian period, Sadatoshi gave the name to the family who at the time, owned the Tachibana castle.
For many years, they were seen as the loyal retainers of the Ōtomo clan, mainly because they served them in battle against the
Shimazu clan
, whom at the time were the Ōtomo’s rivals. In the mid – 16th century an argument between Ōtomo Akitoshi and Ōtomo Sorin, led to the former leaving the clan, and adopted the name Tachibana Dōsetsu.