On record, the founder of the Sato family was Ichiroemon Nobuhisa SATO, a samurai who had served the Hagi clan since about 1662 and received a rice stipend of 2 koku 4 to (432.936 cubic decimeters) for two members of the family.
確認できる佐藤家の初代は市郎右衛門信久といい、寛文2年（1662年）頃から萩藩の武士となり、扶持方2人・米2石4斗を受けた。