The fact that the black-inked impressions (used in official documents) of the seals used by generations of the head of the Takagi clan included the name 'Taneyoshi' has supported the historical fact that it was he who built the foundation for the Takagi clan to grow.
高城氏歴代当主の印が「胤吉」の名義が入った黒印であった事からも、胤吉が高城氏発展の基礎を築いたという事実が裏付けられる。