What is a question about this article? If the question is unanswerable, say "unanswerable".

Beginning roughly in the 14th century in Florence, and later spreading through Europe with the development of the printing press, a Renaissance of knowledge challenged traditional doctrines in science and theology, with the Arabic texts and thought bringing about rediscovery of classical Greek and Roman knowledge.

When was the start of the period known as Greek and Roman?
unanswerable