The history of tea in Japan began as early as the 8th century, when the first known references were made in Japanese records. Tea became a drink of the religious classes in Japan when Japanese priests and envoys sent to China to learn about its culture brought tea to Japan. The Buddhist monks Kūkai and Saichō may have been the first to bring tea seeds to Japan. The first form of tea brought from China was probably brick tea. Tea became a drink of the royal classes when Emperor Saga encouraged the growth of tea plants. Seeds were imported from China, and cultivation in Japan began.