"Azuma-kagami", a book compiled in a later period by the Hojo family of the Kamakura bakufu, included many heroic tales concerning Yasutoki; however, the intentions are obvious in some of these tales, which seem to attribute the episodes of other people (see Public Hornoring of Tokuso family in "Azuma-kagami").
また鎌倉幕府北条氏による後世の編纂書『吾妻鏡』には、泰時に関する美談が数多く記されているが、中には他人のエピソードを流用している作為も見られる（吾妻鏡得宗家の顕彰参照）。