Nobunari was the son of Matsudaira Hirotada and was adopted by Naitô Kiyonaga. He served Tokugawa Ieyasu first as a page and fought in the 1565 Mikawa monto riot and distinguished himself at the fight for Koromo castle. He later saw action at Mikatagahara (1573) and Nagashino (1575). He was given the castle of Nirayama in Izu (10,000 koku) in 1590 and would end his career with a 50,000-koku fief at Nagahama in Ômi province.
References
- Initial text from Samurai-Archives.com FWSeal & CEWest, 2005