i don't understand how Romanticism in the early 19th century have to do with Napoleon?

Answer 1

Romanticism embraced nationalism and thus supported Napoleon at first. Check these sites for bits of additional information.

http://www.wsu.edu/~brians/hum_303/romanticism.html

http://en.wikipedia.org/wiki/Romanticism

http://web.cocc.edu/cagatucci/classes/eng109/romanticism.htm

Answer 2

i though romanticism went against napoleon (since he was during the Enlightenment?

Answer 3

Note that I said that romantics supported Napoleon at first. Please read the sites to see how they became disillusioned with him.