Yes. I see Charlemagne as the "founder of Europe". Napoleon didn't leave much of lasting value, even for France (he repudiated the metric system). I suppose his legal system is admired in France, but I don't think much of "Guilty until proven innocent"The only two genuine candidates in this case are Charlemagne and Napoleon. For the 'term' impressive is quite vague and if we were to look at what they caused Europe-wide, we could honestly say that both these men introduced Europe to a completely new era through their achievements and failures.
It's true the Frankish Kingdom broke up after Louis I but those pieces became France, Germany and Italy.