Miyake Nagamori served as a bushō during the Sengoku and Azuchi-Momoyama periods.  He was a retainer of the Noto-Hatakeyama clan.

Nagamori was born as the son of Nukui Tsugumune and was the younger brother of Nukui Kagetaka.

In 1555, his grandfather, Nukui Fusasada, was murdered by Hatakeyama Yoshitsugu so Nagamori and his older brother, Kagetaka, absconded to Kaga Province.  During the Kōji Rebellion that was triggered in the wake of the killing and ran until 1560, Tsugumune and Miyake Fusahiro were killed in action.  Consequently, it is surmised that Nagamori inherited the Miyake clan.  In 1566, Yoshitsugu and his son, Hatakeyama Yoshitsuna, were expelled by senior retainers of the Noto-Hatakeyama clan.  As a result, Nagamori was permitted to return to Noto and, under the newly supported lord, Hatakeyama Yoshinori, wielded authority along with Kagetaka as members of the Hatakeyama Group of Seven (senior retainers of Yoshinori).  In 1574, following the early demise of Yoshinori, Nagamori backed his younger brother, Hatakeyama Yoshitaka, who was still in his youth, so Nagamori maintained his power within the clan.  Apparently, he was known for exercising his despotic tendencies.

The Nukui, the Miyake, and Yusa Tsugumitsu were subordinate to the Uesugi clan of Echigo Province so their authority was taken away by Chō Tsugutsura and Chō Tsunatsura (father and son) who colluded with the Oda clan which had pacified Echizen by subduing the Asakura clan and expanded its reach to Noto.  In 1576, after Uesugi Kenshin invaded Noto, Nagamori holed-up in Nanao Castle and fought against the Uesugi army but the situation gradually turned unfavorable for the defenders.   This is known as the Siege of Nanao Castle.  On 9/15 of Tenshō 5 (1577), Nagamori, together with Kagetaka and Yusa Tsugumitsu, was lured by Kenshin so obliterated a majority of the Chō family and became a retainer of the Uesugi.

In the wake of Kenshin’s death in the third month of 1578, Oda Nobunaga began another invasion of Noto.  In 1579, Nagamori betrayed the Uesugi and seized control of Nanao Castle.  He then offered the castle to Nobunaga and surrendered.  In 1581, he was banished by the Oda clan and fled for safety to Echigo.

On 6/2 of Tenshō 10 (1582), Oda Nobunaga died unexpectedly in a coup d’état led by one of his senior retainers, Akechi Mitsuhide, in an event known as the Honnō Temple Incident.  In the wake of the incident, conflicts broke-out in many locations including the Hokuriku.  Aiming to restore their authority, Nagamori and Kagetaka obtained support from Uesugi Kagekatsu (the adopted son of Kenshin who became his successor), gathered together former retainers of the Hatakeyama clan, and raised arms on Mount Sekidō in Noto.  In the ensuing Battle of Arayama, Maeda Toshiie (the lord of the province) with reinforcements from Sakuma Morimasa launched a counterattack and, on 6/26, Nagamori and Kagetaka were killed in battle.

Character

Owing to the history among Nagamori, Kagetaka, and Tsugumitsu to replace successive generations of lords of the Noto-Hatakeyama clan and operate as unrestrained autocrats from behind the scenes, in later eras, his legacy was viewed unfavorably.  In many history novels, he was characterized as a betrayer who excelled in the art of self-protection and was disloyal to his lord.  Yoshinori died under suspicious circumstances in his twenties, and, according to one theory, he was the victim of poisoning based on a plot by Nagamori, Kagetaka, and Tsugumitsu to replace him with a youthful new lord (whom they could control as their puppet).