After Sekigahara, Ieyasu appointed Masayuki's eldest son, Sanada Nobuyuki (Nobushige), as daimyo of Matsushiro Domain with 100,000 koku. After Masayuki's death, Nobuyuki settled in Matsushiro, and the Sanada ruled the domain for ten generations. The Sanada Treasure Museum holds armor and letters associated with both Nobuyuki and Masayuki.