Equality before law.

It is a fundamental libertarian principle that the law applies equally to all of us as moral beings. Equality before the law is a core principle of classical liberalism and libertarianism.

You can't argue that a period of time was a zenith of libertarian principles when the law didn't apply equally to a majority of the population. No matter how many ways you list that the state had less power than today, it had enormous power over that majority in a direct violation of libertarian principles.

To ignore equality before the law as a core, foundational libertarian principle is to, frankly, misunderstand what the liberal tradition out of which libertarianism emerged (or should, anyway) was all about.