Addressing royalty in French?

I'm writing a story set in a time similar to the medieval/renaissance period in England/Anglo-whatever, and there's a king. He has a French head steward, who addresses him directly. I know the French word for king is "roi" or "roy," but we don't say, "Yes, king." So, how... show more I'm writing a story set in a time similar to the medieval/renaissance period in England/Anglo-whatever, and there's a king. He has a French head steward, who addresses him directly. I know the French word for king is "roi" or "roy," but we don't say, "Yes, king." So, how should this French steward address the king?
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