I want to know the answer to the following question:
When is the first known use of 'samurai'?
All the background I'm provided with is that "According to translator William Scott Wilson: "In Chinese, the character 侍 was originally a verb meaning "to wait upon" or "accompany persons" in the upper ranks of society, and this is also true of the original term in Japanese, saburau.". Is that enough to answer the question?
Answer: no