Empedocles
Empedocles of Acragas
Empedocles of Acragas (in Sicily; active mid-5th century) tried to reconcile the views of Heraclitus and Parmenides by identifying four basic elements (which become the standard elements up until modernity): earth, water, air, and fire. These elements remain unchanging but combine to form the changing and moving world of our senses.