According to "Katsushika Hokusai Den (Biography of Hokusai KATSUSHIKA)" by Kyoshin Iijima, Heihachiro KOBAYASHI, an expert swordsman who had been treated as a hero of the Kira side in the Genroku Ako Incident (Chushingura [The Treasury of Loyal Retainers]), had a daughter who later married Ise NAKAJIMA, an artist of mirrors, and gave birth to Hokusai KATSUSHIKA.
飯島虚心『葛飾北斎伝』によれば、元禄赤穂事件（忠臣蔵）で吉良方のヒーローとして扱われている剣客の小林平八郎には、娘が一人いて、その娘が後世、鏡師中島伊勢に嫁ぎ、そこで生まれた子が葛飾北斎であるという。