The scripture that introduced Benzaiten to Japan, the Sutra of Golden Light, was not simply one Buddhist text among many but one of the most politically important scriptures in the entire East Asian Buddhist world, valued above all for its claim that a ruler who has the sutra properly copied, recited and venerated will receive the protection of its guardian deities against invasion, natural disaster and social disorder, a promise that made the text a natural instrument of state religious policy across China, Korea and Japan. In Japan this belief reached its fullest institutional expression under Emperor Shomu in the eighth century, who in 741 ordered the establishment of a network of official provincial temples, the kokubunji, across the country, explicitly built around ritual use of the Sutra of Golden Light for the protection and stability of the state, with a central temple, Todaiji in Nara, home to the great bronze Buddha, serving as the head of the entire system.
Benzaiten's role within the sutra as a protector deity who grants wisdom and eloquence to those who uphold the teaching was thus originally tied to this larger, state-level project of using Buddhist ritual to secure the safety and legitimacy of the Japanese imperial government itself, a considerably more political original context than her later, more intimate popular association with wealth, music and personal good fortune that developed as her cult spread beyond court-sponsored ritual into wider Japanese religious life over the following centuries.