Anaximander was said to have lived from 610BC - 546BC. He was most commonly known as the 'father of cosmology'. Anaximander was a student of Thales and Miletus, and he believed that the first principle of the universe was air and apeiron.
Apeiron is described as a 'limitless, endless, ageless mass that continually produces new materials from which the physical universe is derived'. Apeiron is capable of embracing opposites such as hot and cold, light and dark.
Anaximander also believed in a primitive form of evolution, that worlds existed beyond this one, that the sun was a giant mass far from the earth. He also believed that elements caused natural phenomenon such as storms, and it was not God.