According to 'Hakuseki Shukan' written by Hakuseki ARAI, Ietsuna took pleasure in reading the 'Joganseiyo,' a political book written about Taiso, the second Emperor of Tang Dynasty in China, and consulted it for administration of the bakufu.
新井白石著の「白石手簡」では、家綱は中国の唐時代の政治書である「貞観政要」を好み、幕政運営の参考にしたという。