Final answer:
Thales of Miletus is renowned for arguing against mythical explanations for natural phenomena, emphasizing natural causes and contributing to the foundation of scientific inquiry.
Step-by-step explanation:
The most famous person from antiquity to argue that myths were not true was the Greek philosopher Thales of Miletus. Thales is known for setting out to understand natural forces without resorting to supernatural or mythical explanations, a radical approach in his time. He sought to explain phenomena like earthquakes through natural causes rather than as acts of the gods, marking a departure from the mythologically infused explanations commonly accepted before his era. Thales, and other pre-Socratic philosophers, paved the way for a more rational and empirical approach to understanding the world, laying the groundwork for scientific inquiry.