The Clear Mirror (Masukagami) is an account of Japanese history from 1185 to 1333 by an anonymous author, almost certainly a court noble writing around the third quarter of the fourteenth century. During this time, the military government at Kamakura controlled the country, maintaining the emperor with his court at Kyoto as symbolic head of state.

The Clear Mirror is at least semifictionalized, promoting a picture of a court healthier and more powerful than it really was. Moreover, the work sees the court as guardian of its own traditional arts and lifestyle, and thus provides not only a history of imperial succession and other events but also copious examples of poetic expressions and descriptions of courtly traditions and ceremonies.

The introduction provides a brief summary of the significant historical and political events of the period, together with a discussion of the significance of The Clear Mirror within the "historical tales" tradition, and comments on the literary strengths and weaknesses of the work.