Enlightenment thinkers like Adam Smith and John Locke were hugely important historically in making the case for liberty. However, they were still products of their time and retain the influences of Christian ethics and Humean skepticism. Adam Smith, for instance, argued that competition was good because it maximised social well-being - which leads directly to the modern viewpoint that free markets are OK but that the government should step in to prevent monopolies and ensure businesses only make a "fair" profit (as defined by the government). This is what I mean by the pragmatic defence of property.

The most influential enlightenment philosopher was Kant, who was ostensibly pro-liberty but whose work paved the way for Hegel and Marx.

I might sound like a fanatic but if you actually read Rand it becomes clear how revolutionary her philosophy actually was. She's a system-builder, something unknown in modern philosophy (since Kant). Modern-day libertarianism is mostly a creation of Rothbard's, a one-time student of Rand's who later put all his energy into discrediting her while plagiarising her philosophy. (Just one example: the initiation of force as the basic social evil is an original concept of Rand's).