Master_Pedant wrote:
http://www.mendeley.com/research/illiberal-libertarians-why-libertarianism-is-not-a-liberal-view/
Doesn't help us.
The selection of archetypal liberals isn't neutral, as Rawls and Mill are both noted as left-wing. Variation within the political belief(or any label) is understated given that often these words match up to a family of ideas, rather than a single one(something I *thought* you were the one to bring up with the idea of igtheism). And a question still emerges on whether the paper hinges on a peripheral issue.
As it stands, we are left with a bit of a historical issue because there have clearly been pre 20th century libertarians, even though the label "libertarian" when applied to those beliefs was entirely a 20th century invention. What would those people be called? For instance, I am thinking of folks such as Frederic Bastiat, Herbert Spencer, and others, as it seems to me that they would still have to be considered classical liberals, even though they are libertarian/proto-libertarian, and well... the existence of proto-libertarian classical liberals seems to keep libertarianism a legitimate liberalism, if not just an off-shoot of liberalism.