The notion of the "unmoved mover" (originating from the Ancient Greek phrase "ὃ οὐ κινούμενον κινεῖ" which translates to "that which initiates motion without being set in motion") or the "prime mover" (referred to as "primum movens" in Latin) was introduced by Aristotle as a fundamental cause, often described as the initial uncaused cause, or the impetus behind all motion within the cosmos.