 By order of Shōgun Tokugawa Tsunayoshi, Yorisada was granted a fief of 20,000 "koku" in Moriyama in Tamura District in Mutsu Province in 1700.His original holdings reverted to Mito Domain.Although the "daimyō" of Moriyama were not subject to "sankin-kōtai" since they were direct relatives of the ruling Tokugawa, they preferred to reside permanently at the clan's Edo residence in Koishikawa and to leave administration of the domain in the hands of overseers appointed by the parent house at Mito Domain.