No it is not. You tried to say in "Napoleonic times" it WAS left and moved right.

That is not how ideologies work and that is not how the political spectrum works either. Literally google political spectrum I would bet my testicles enough of them exist that literally label the left side "Liberal"

And no my polisci professor did not say it is the opposite of conservatism especially because it predates such a thing. In fact conservatism is considered a reactionary political stance to liberalism. Instead he made it clear before Liberalism there was really only traditionalism and people discussing concepts like liberty and freedom and such, there wasn't anything to compare it to. He also made it clear that defining these and stances about these politics is extremely difficult for example people still dunno if Jefferson agreed or disagreed with Locke because of the life, liberty and pursuit of happiness line.

But what he did make absolutely clear was the political spectrum was not very well made and that liberalism is left wing you dope