What kind of French wrote the French Kings in 13th century?

What is it about?

In 13th century, the royal French chancery used largely Latin as written language. But there are also some French written documents. What kind of French was used for them, and why?

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Why is it important?

It's the first article showing that the royal French chancery wrote - when French was used instead of Latin - different varieties of French; there was no "linguistic policy" in favor of "Parisian" French.

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