 Complete the following phrase:  Evidence of the use of Pueraria mirifica can be definitively identified as early as the 13th Century AD. The ancient capital of Burma, known then as Pookham but now called Bagan, was one of the most important centers of knowledge in the Asian region until being sacked and partially destroyed by Kublai Khans Mongol invasion of the late 13th Century. In 1931 a text was discovered secreted within the walls of a Buddhist temple that predated the 