Who was the ancient Greek philosopher who taught that "know thyself" was the most important maxim?

 The ancient Greek philosopher who emphasized the maxim "Know thyself" was Socrates.

About Socrates:

• Lived: circa 470–399 BCE
• Known for: His method of questioning (the Socratic Method) to stimulate critical thinking and illuminate ideas
• Philosophy: He believed self-knowledge was essential for living a virtuous and meaningful life. The phrase "Know thyself" captures his emphasis on understanding one’s own nature, limitations, and ethics.

Context of "Know Thyself":

• The phrase actually originated from the Temple of Apollo at Delphi (an ancient Greek religious site), where it was inscribed as a guiding principle.
• Socrates adopted and popularized this idea, making self-awareness central to philosophy and ethics.