In 1638 (Kanei 15), **Matsudaira Naomasa** — grandson of Tokugawa Ieyasu and third son of Yuki Hideyasu (Ieyasu's second son) — was transferred from Matsumoto in Shinano Province to become the first Matsudaira lord of Matsue. Naomasa had distinguished himself in the Summer Campaign of the Osaka Siege (1615). The Matsudaira clan of Echizen served as a **Tokugawa branch family (shinpan)**, anchoring Izumo Province as a strategic bastion of shogunal authority along the Sanin coast for approximately 230 years until the abolition of feudal domains in 1871. The most celebrated of the ten Matsudaira lords was the seventh, Harusato (Fumai), whose fiscal reforms and patronage of tea ceremony culture gave Matsue its enduring reputation as Japan's 'city of tea.'