Aristotle and Blackstone both supported the restriction of the arbitrary use of government power based on well-defined and established laws which is known as?

The restriction of the arbitrary use of government power based on well-defined and established laws is known as the rule of law. Both Aristotle and Blackstone believed in the importance of the rule of law as a safeguard against arbitrary and tyrannical governance.

The concept you are referring to is known as the rule of law. The rule of law is the principle that all individuals and institutions are subject to and accountable to well-defined laws and procedures. It requires that laws are clear and transparent, applied equally to all citizens, and enforced by an independent judiciary. Both Aristotle, the ancient Greek philosopher, and Blackstone, an English jurist, supported the idea of the rule of law as a means to prevent the arbitrary exercise of government power.