Zeno of Elea

“…he purpose of the arguments was a defense of his teacher’s ideas. Parmenides believed that reality was one, immutable and unchanging. Motion, change, time and plurality were all mere illusions. This, of course, attracted many critics. Zeno’s paradoxes attempted to show that holding the opposite position, that reality was many, was contradictory and absurd. Therefore, “the one” must be the correct philosophy.”

Source: MathCS.org – Real Analysis: 9.12. Zeno of Elea (495?-435? B.C.)