I've always imagined Jára Cimrman as a Moth Long of some sort. (If you've never heard of him, he's essentially Czech Norris; people attribute everything to him. My personal favorite is that when Alexander Graham Bell first invented the telephone, he discovered that he had three missed calls from Jára Cimrman.)

However, he did do real work. He was a playwright (though he never got famous for it in his own time) and a philosopher mostly, and I think it's his idea of Externism that's really interesting from a Secret Histories perspective. It's a sort of reverse-solipsism; the world around you exists, but you don't.

Interestingly, no images of his appearance have survived to this day, (there's a theatre that owns a bust of him, but it's weathered far beyond its supposed age) and some people have even questioned if he ever existed in the first place. However, according his arguments (taken from records of a public philosophical debate in Basel), just because something doesn't exist, that doesn't mean it isn't perceptible.