Matsudaira Ietada (Fukōzu)

Matsudaira Ietada (松平家忠) was a Japanese samurai of the Sengoku period through late Azuchi-Momoyama period, who served the Tokugawa clan, and became a daimyo in 1590. Ietada was the eldest son of Matsudaira Koretada, the head of the Fukōzu branch of the Matsudaira clan. Ietada served Tokugawa Ieyasu from a young age, and fought in many of Ieyasu's campaigns. Upon the latter's entry into the Kantō region in 1590, Ietada was granted the 10,000 koku fief of Oshi. Oshi had been meant for Ieyasu's fourth son Tadayoshi; however, as Tadayoshi was still young, the fief was entrusted to Ietada's stewardship. When Tadayoshi came of age, he was granted Oshi, and Ietada was moved to the Omigawa Domain in Shimōsa Province. Ietada was assigned to Fushimi Castle together with Torii Mototada; the two men died in battle there, shortly before the Battle of Sekigahara.

Ietada is famous for his journal, Ietada nikki (家忠日記), which he kept for the 17 year interval between 1575 and August of 1594.