It follows a 'romantic' notion of chess that despises defense and
admires the all-out attack.


Anders Thulin wrote:

King Leopold wrote:

Why is it called The 'Romantic' King's Gambit?
What makes it 'Romantic'?


Don't forget to ask 'when', as well.

Wasn't it Spielmann who was described as the last knight
of the king's gambit? That should give you the perspective:
1920's or so, when the hyper-modern chess began to become accepted.

Playing King's Gambit then probably seemed like hankering
for the good old days when an Evans still would be a suprise.
And so, of course, romantic -- though 'nostalgic' probably
is the better word to use here.

Of course, it was said much later than that, some other notion
of romanticism may have been used instead.