Matsudaira Nobutsuna

Matsudaira Nobutsuna (1596–1662) was born into the Ōkōchi family and adopted by his uncle Matsudaira Masatsuna. In 1604 he was assigned as a page to the newborn heir, the future Iemitsu, and he became a rōjū, a senior councilor of the shogunate, in 1633. Personal service grew into responsibility for national government. His later lordship at Kawagoe, received in 1639, also gave him a territory in which to carry out administration directly. [S01, S02]

During the Shimabara-Amakusa rising he commanded shogunal forces with Toda Ujikane. The fall of Hara Castle in 1638 brought mass killing, including the death of Amakusa Shirō. After Iemitsu died in 1651, Nobutsuna helped sustain the government of the new shogun Ietsuna alongside other senior officials. He also dealt with the 1651 Keian conspiracy crisis and the reconstruction following Edo’s great fire of 1657. His work joined military coercion to the maintenance of government through succession and urban disaster. [S01, S04]

At Kawagoe he promoted transport, land surveys and settlement. In 1655 he ordered his retainer Yasumatsu Kin’emon to build the Nobitome waterway, drawing from the Tamagawa Aqueduct to supply drinking water to settlers on a dry plateau. Nobutsuna died in 1662. Later anecdotes celebrated him as “the wise Izu,” using his court title; his more tangible legacy lay in administrative work and water infrastructure, alongside his role in violent suppression. [S01, S02, S03]