Democritus (* approx. 460 B.C., † approx. 375 B.C.)

As far as in the antique Greece, philosophers
reflected upon the thought of vacuum. It all
began with a rather complicated expression
by the philosopher Democritus, who stated:
„The Ichtys“, meaning matter itself, „does not
exist by any degree more than nothingness.“
What he wanted to say is, that the emptiness,
so to speak the vacuum, is real. He argued further,
that without the emptiness, there would never be
motion, since matter can only move, if it engulves
space, which needs to has been empty beforehand.