Bill Gates, Microsoft Co-Founder and world's richest man, received an honorary knighthood from Queen Elizabeth II. The accolade allows the recipient to use "KBE" after his name, but not "Sir" in front of it.

He was honored in a private ceremony at Buckingham Palace for his charitable activities around the world and his contribution to high-tech enterprise in Britain.

While receiving the knighthood, Gates proclaiming himself "humbled and delighted".

Source: CNN.com

I prefer the term master myself

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Final Fantasy