ðə klˈæn mˈuːvd ɪts sˈiːt fɹʌm ʃɪmˈoʊsə tə mˈʌtsuː pɹˈɑːvɪns ɪnðɪ ˈɜːli kˌæmɐkjˈʊɹɹə pˈiəɹɪəd, ænd wɜː kənfˈɜːmd æz dˈeɪmɪˌoʊ ʌv sˈoʊmə nˌækɐmjˈʊɹɹə dəmˈeɪn ˌʌndɚ ðɪ ˈiːdoʊpˈiəɹɪəd tˌoʊkjuːɡˈɑːwə ʃˈɑːɡənˌeɪt.
The clan moved its seat from Shimōsa to Mutsu Province in the early Kamakura period, and were confirmed as daimyō of Sōma Nakamura Domain under the Edo-period Tokugawa shogunate.