I want to know the answer to the following question:
When did Emperor Huan's reign begin?
All the background I'm provided with is that "In addition to tributary relations with the Kushans, the Han Empire received gifts from the Parthian Empire, from a king in modern Burma, from a ruler in Japan, and initiated an unsuccessful mission to Daqin (Rome) in AD 97 with Gan Ying as emissary.". Is that enough to answer the question?