1) The relatives of Masanobu and his son, Motonobu, were in the Shimotsuke Province (present day Tochigi Prefecture); 2) Masanobu's early work "Kanbaku-zu"(Viewing a Waterfall) was left at Chorin-ji Temple, Ashikaga City, Tochigi Prefecture; 3) the above mentioned "Kanbaku-zu" has the note 'Donated to his highness Kagenaga NAGAO.'
（1）正信やその子・元信の縁者が下野国（しもつけ、現栃木県）方面に見られること、（2）栃木県足利市の長林寺に正信の初期作品である『観瀑図』が残ること、（3）前記『観瀑図』に「長尾景長公寄進」との外題がある。