Sano was born in Hayatsue, Saga Domain (present-day Saga city, Saga Prefecture) as the fifth son of the low ranking samurai Shimomura Saburōzaemon.
The passage describes Sano's birth place and family background. It states that he was born in Hayatsue, Saga Domain (present-day Saga city, Saga Prefecture) as the fifth son of a low-ranking samurai named Shimomura Saburōzaemon.