On October 24, 1606, Yorifusa TOKUGAWA, the 11th son of Ieyasu TOKUGAWA, was given a fief of one hundred thousand koku (which yielded approx. 18 million liters of rice) in Shimotsuma in Hitachi Province, and started his own family.
1606年（慶長11）9月23日、徳川家康の十一男である徳川頼房が常陸国下妻10万石を与えられ家を興す。