Until the fifteenth century, Vietnam was essentially a Buddhist country. The piety of the dynasties constituted their source of legitimacy, and Buddhism provided a means for royal authority to penetrate and incorporate the local political structure. In the face of the development of social unrest, however, Confucian literati started to voice their concern for the maintenance of order and eventually emerged in the fifteenth century as spokesmen for royal authority, definers of public morality and guardians of the court. As a result, institutional Buddhism lost the court patronage it had previously enjoyed, and henceforth its political influence declined steadily.