Lifespan: Tenbun 6 (1537) to 5/21 of Tenshō 3 (1575)
Other Names: Matahachirō, Tonomo-no-suke
Lord: Tokugawa Ieyasu
Father: Matsudaira Yoshikage
Mother: Daughter of Matsudaira Kiyosada
Siblings: Koretada, Chikasada, sister (wife of Ogasawara Yasutsugu), sister (second wife of Matsudaira Nobukazu), sister (wife of Matsudaira Kiyomune)
Wife: [Formal] Second daughter of Udono Nagamochi
Children: Ietada, Tadakatsu, Korenaga, Harushige, Shōi, Chiiha, Osachi, Banshōin, Oichi
Matsudaira Koretada served as a bushō during the Sengoku and Azuchi-Momoyama periods. Koretada was the third head of the Fukōzu-Matsudaira family and served as the lord of Fukōzu Castle in the Nukata District of Mikawa Province.
Koretada was born as the eldest son of Matsudaira Yoshikage, the second head of the Fukōzu-Matsudaira family – a branch of the Matsudaira clan founded by Matsudaira Tadasada.
In 1561, Koretada was assigned Nakashima Castle. On 4/15 of Eiroku 4 (1561), Koretada deployed with a reinforcement army to Uenokamimura Castle in support of Sakai Tadanao who was under attack by Kira Yoshiaki of Tōjō Castle. Nakashima Castle, defended by a limited number of soldiers, was then attacked by supporters of Yoshiaki, whereupon Koretada’s father, Yoshikage, rushed from Fukōzu Castle to assist the garrison. He was then killed at the Battle of Zenmyōtsutsumi. Thereafter, Koretada succeeded him as the third head of the Fukōzu-Matsudaira family.
In 1563, forces led by Takeda Shingen assaulted Nagasawa Castle, but, after small-scale clashes, Koretada repelled them. Later that same year, during the Mikawa Ikkō-ikki, Koretada attacked Ōtsu Hanemon-no-jō, Otobe Hachibei-no-jō, and Natsume Yoshinobu holed-up at 野羽 Castle (or Mutsuguri Castle) in the environs of Fukōzu Castle supporting the ikki. After Hachibei-no-jō colluded, Yoshinobu was captured alive. Later, owing to the ardent appeal of Koretada, Yoshinobu was permitted to return to the service of the Fukōzu-Matsudaira.
Thereafter, Koretada served in all of the primary battles including the Siege of Yoshida Castle in 1565, the Siege of Kakegawa Castle in 1569, the Battle of Anegawa in 1570, and the Battle of Mikata-ga-hara in 1572. Koretada served as a meritorious retainer in the early era of Ieyasu.
In the fifth month of 1575, Koretada participated in the Battle of Nagashino. On the night of 5/20, Koretada was in charge of one of the wings of a detached division led by Sakai Tadatsugu upon orders of Oda Nobunaga. Under the cover of darkness, the forces head-out to capture Mount Tobisu. Early in the morning on 5/21, Koretada slayed an enemy commander named Takeda Nobuzane (the younger brother of Shingen). In the subsequent pursuit of the fleeing enemy forces, Koretada went too far over the front line and, after incurring a fierce counterattack by 500 soldiers led by Oyamada Masayuki in the Takeda army, he was killed in action. He was thirty-nine years old. Koretada was one of the more prominent bushō in the allied forces of the Oda and Tokugawa to die at the Battle of Nagashino.
His grave is at the Honkō Temple on Mount Zuiun, the family temple of the Fukōzu-Matsudaira family. A stone monument to Matsudaira Koretada stands at the location where he was killed in battle.