The clan, which bore no direct relation to the Tachibana clan of the Heian period, originated with Ōtomo Sadatoshi (d. 1336), who took on the name and assigned it to the family of Ōtomo vassals who held Tachibana castle. For a time, the Tachibana served as loyal retainers under the Ōtomo clan, regularly battling the Shimazu, rivals to the Ōtomo. In the mid-16th century, a conflict between Ōtomo Akitoshi and Ōtomo Sōrin led to the former splitting from the family, and taking the name Tachibana Dōsetsu.
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