Lifespan: Tenbun 20 (1551) to Keichō 15 (1610)
Other Names: Katakura Kurōdo
Title: Sagami-no-kami (Governor of Sagami)
Clan: Katakura → Yagashiwa
Lord: Mogami Yoshiaki
Yagashiwa Naoie served as a bushō from the Sengoku to early Edo periods. He was a retainer of the Mogami clan. He served as the lord of the Yagashiwa manor in Dewa Province.
Naoie was a servant of Mogami Yoshiaki and initially adopted the name of Katakura Kurōdo. During the Eiroku era (1558 to 1570), he built the Yagashiwa manor and became the Yagashiwa clan.
When his lord, Yoshiaki, came into conflict with the Date clan, Naoie served as a messenger for a settlement. He attended a face-to-face meeting between Yoshiaki on one side and Date Harumune and Date Terumune on the other. There is a story that, at this time, Naoie plotted with Ujie Sadanao to assassinate Kaminoyama Mitsukane, the lord of Kaminoyama Castle who had joined with Terumune, but there are questions regarding the veracity of this story.
In 1600, at the Battle of Keichō Dewa, upon orders of Yoshiaki, Naoie headed toward Hataya Castle but it had already fallen. He fought valiantly to enable the remaining soldiers and residents in the castle to flee. After Iida Harima-no-kami was killed, Naoie charged the enemy forces and took their heads. Naoie’s residence at the Yagashiwa manor was the target of an attack by the Uesugi army but he avoided its fall.
After the founding of the Dewa-Yamagata domain by the Mogami clan, Naoie acquired landholdings of 4,000 koku.