Fukui Domain
In 1721, he was chosen by Matsudaira Yoshikuni as heir to Fukui Domain, and became "daimyō" of Fukui the following year. With his accession to Fukui, Echizen-Matsuoka was dissolved and its territories rejoined to Fukui Domain. After being received in formal audience by Shōgun Tokugawa Yoshimune, he changed his name to Munemasa and was granted Senior Fourth Rank, Lower Grade court rank.