Lifespan: Eiroku 9 (1566) to 12/21 of Keichō 15 (1611)
Rank: bushō, daimyō
Domain: Lord of Mikawa-Yoshida
Lord: Tokugawa Ieyasu → Tokugawa Hidetada
Father: Matsudaira Kiyomune
Mother: Daughter of Matsudaira Yoshikage
Siblings: Iekiyo, Kiyosada
Wife: [Formal] Tenkeiin (daughter of Hisamatsu Toshikatsu)
Children: Tadakiyo, Kiyomasa, daughter (adopted by Tokugawa Ieyasu), daughter (formal wife of Honda Yasunori), daughter (formal wife of Matsudaira Tadatoshi), daughter (wife of Narita Yasutaka)
Matsudaira Iekiyo served as a bushō and daimyō from the Sengoku to early Edo periods. Iekiyo was the sixth head of the Takenoya-Matsudaira family and the first lord of the Yoshida domain in Mikawa Province. The Takenoya-Matsudaira were an illegitimate branch of the Matsudaira clan founded by Matsudaira Moriie, the eldest son of Matsudaira Nobumitsu.
Iekiyo was born as the eldest son of Matsudaira Kiyomune.
Iekiyo served Tokugawa Ieyasu. During his coming-of-age ceremony, he received one of the characters from the name of his grandfather and one from Ieyasu, adopting the name of Iekiyo. In 1590, when Ieyasu was transferred to the Kantō, in recognition of his contributions, Iekiyo was granted landholdings of 10,000 koku in Hachimanyama in the Kodama District of Musashi Province, becoming the lord of Kijigaoka Castle. During the transfer to a new province, his formal wife, Tenkeiin, learned of her pregnancy and later gave birth to a daughter but died soon thereafter.
In 1600, during the Battle of Sekigahara, Iekiyo guarded Kiyosu Castle in Owari Province. After the war, he was granted by Ieyasu landholdings of 30,000 koku in Yoshida in Mikawa and became the first lord of the Yoshida domain in the early Edo period.
On 12/21 of Keichō 15 (1611), Iekiyo died at the age of forty-five. He was succeeded by his lineal heir, Matsudaira Tadakiyo.
His grave is at the Zenei Temple (later named the Ryūdaisan-Tenkeiin) in the city of Gamagōri in Aichi Prefecture.
His younger brother, Matsudaira Kiyosada, served Iekiyo with a stipend of 3,200 koku. His descendants later became retainers of the Edo bakufu.