Who were the first two beings in Greek mythology?

In Greek mythology, the foundation of the cosmos begins with Chaos, a void or a chaotic state that predates creation, and Nyx, the embodiment of night. Chaos represents the initial disordered state from which everything else emerged, while Nyx personifies the night, which, alongside other primordial deities, played a significant role in the early development of the universe.

This choice highlights the origins of Greek mythology, emphasizing the importance of these primordial figures in establishing the universe's structure and the subsequent generations of gods and titans that followed. Other options, while significant in the mythology, come into play later in the genealogical timeline and do not represent the very first beings. Gaia and Uranus, for example, are descendants of Chaos, formed later on from its primordial existence.