Mariyatsu Nobumasa

真里谷信応

Mariyatsu Clan

Sengoku Daimyō

Kazusa Province

Lifespan:  Eishō (15xx) to Tenshō (15xx)

Other Names:  

Rank:  sengoku daimyō

Clan:  Mariyatsu-Takeda (Kazusa-Takeda clan)

Father:  Mariyatsu Jokan

Siblings:  Zenkan (Takeda Taifu), Nobutaka, Nobumasa

Children:  Nobutaka (written with a different character than his older (illegitimate) brother

Mariyatsu Nobumasa served as a sengoku daimyō of Kazusa Province during the Sengoku period.

The Mariyatsu were a collateral line of the Takeda clan of the Kai-Genji, an illegitimate branch of the Kawachi-Genji descended from the Seiwa-Genji.  The Mariyatsu-Takeda were members of the Kazusa-Takeda clan.

Nobumasa was born as the lineal heir of Mariyatsu Jokan, a sengoku daimyō of Kazusa.  At the time of his birth, his older illegitimate brother, Mariyatsu Nobutaka, had already been designated the successor to his father, Jokan.  Therefore, upon Jokan’s retirement, Nobumasa did not inherit the headship of the clan.  At the time of succession to Nobutaka, Ashikaga Yoshiaki (the Oyumi kubō and a former rival of Jokan) interfered while Mariyatsu Zenhō, the younger brother of Jokan and an influential figure in the Mariyatsu family, supported Nobumasa.  This enabled Nobumasa to defeat Nobutaka and forcibly take over the clan.  In 1538, Nobumasa’s patron, Yoshiaki, died in the First Battle of Kōnodai.  Nobutaka then combined forces with Hōjō Ujitsuna to mount a counterattack, ousting Nobumasa and reclaiming the headship of the clan.  Thereafter, Nobumasa turned to Satomi Yoshitaka for support.

Later, after Nobutaka’s lineal heir and successor, Mariyatsu Nobumasa (written with a different character than Nobutaka’s brother), was attacked by Yoshitaka, Nobumasa (Nobutaka’s brother) suddenly rebelled against the Satomi and came to the aid of his nephew (Nobutaka’s son named Nobumasa).  This appeared to owe to the threat posed by the Satomi to the Mariyatsu after Masaki Tokishige (a member of the Satomi clan) killed Mariyatsu Tomonobu and captured Ōtaki Castle in the Isumi District of Kazusa.

On 11/4 of Tenbun 21 (1552), owing to the fall of Shiizu Castle, Nobumasa (Nobutaka’s son) took his own life and, three days later, Nobumasa (Nobutaka’s brother and the subject of this profile) was cornered and took his own life.  On 12/14, Hōjō Ujiyasu donated temple lands for a memorial tower for Nobumasa (Nobutaka’s brother).