Who was the first Russian Czar to speak French?

Question

This is a follow up to my earlier question about when the Russian aristocracy starting speaking French.

Answer 1

Peter III (Peter the Great) made French the norm of his court. It would be hard to prove that none of his predecessors spoke any French, but he embraced the language.
"Many Russian novels of the 19th century, e.g. Lev Tolstoy's "War and Peace", contain entire paragraphs and even pages in French with no translation given, with an assumption that educated readers won't need one."