While his father died in Kiyomasa's childhood, his mother Ito was one of the female cousins (or a distant relative) of Omandokoro (Mother of the chief Adviser to the Emperor), biological mother of Hideyoshi TOYOTOMI.
父は清正が幼いときに死去したが、母・伊都が豊臣秀吉の生母である大政所の従姉妹（あるいは遠縁の親戚）であった。