How famous is King Crimson around the world ?

I discovered King Crimson like 2/3 years ago and got instantly obsessed by this band (Epitaph is one of the most powerful song I ever listened)

I had never heard about them before, and when I ask my family if they know KC, they answer me "no", yet, they have a good musical culture, especially about rock

So I though King Crimson was underground, until I discovered that they influenced many artists, even a french rock band who make a live cover of "21th Century Schizoid Man" (not as good as the original, however)

So, is King Crimson realy, realy famous and we are uncultivated ? Or King Crimson just doesn't get the fame they deserve ?