Who made apeiron?

Could you please elaborate on the origins of the concept of apeiron? Who was the first to propose this idea, and in what context did they introduce it? Was it a philosopher, mathematician, or perhaps someone from a different field entirely? What was the motivation behind their theory, and how did it contribute to the development of thought in ancient Greece and beyond? Additionally, have there been any significant developments or reinterpretations of the concept of apeiron in modern times?