Yoshiaki was a minor power in Mutsu province. He established himself at Miharu castle in 1503, moving from Moriyama Castle, and married a daughter of Iwaki Tsunetaka. He turned control of the Tamura clan to his son Takaaki in 1532. His branch of the Tamura clan became known as the Miharu Tamura.
- Initial text from Samurai-Archives.com FWSeal & CEWest, 2005