Some historians will say classical learning came to Europe from Constantinople; some historians will say it came through Spain.
I would agree with both. The seedlings of classical learning may have even ignited in Italy after 1204, when large amounts of booty was carried off from Constantinople. After the fall of Constantinople many byzantine romans fled to the city-states of Italy. Some even before such as Manuel Chrysolarus. You also had the Moors of Spain contributing alot. Many greek manuscripts translated into arabic and into the european languages. There was an italian renaissance and a spanish rennaisance. Throw in the invention of the gutenberg press to tie everything together and you have a renaissance.