So impressive was Ashoka's example that many other Asian monarchs adopted it. Japan's Prince Shotuku, for example, used it to unify the Japanese nation and improve international relations. For this policy, the renowned historians Arnold Toynbee and H.G. Wells have called Ashoka the greatest monarch who ever lived. Furthermore, when India commanded superiority in the eyes of the nations that wanted to receive its Buddhist civilization (such as China, Mongolia, Cambodia, Indonesia and Thailand), there was never any attempt to impose rulers or governance on others, or ask for taxation or tribute to any Indian nexus, or subvert the native cultures, languages and histories of those nations. The contrast between this and the manner in which Western civilization has spread is stark and warrants greater attention.