The presocratics are know as the first Philosophers, at least in the western world and according to written history.

They asked the question "what's the world made of at its most basic and fundamental level?"

Little of their works remains intact today but what does survive tells of a fundamentally different worldview than ours today.

They're answers to the question of what's the world made of, and their views on their understanding of those answers, underscores just how radically different our worldviews are.

Where today we have strong lines between notions of the secular and the sacred, their material bases for the fundamental constituent(s) of the world were seen as either divine, eternal, or infinite or all of the above!

Whether it was Pythagoras' mathematical universe, Thales ...