Whose idea about inertia became Newton's First Law of Motion?

The idea about inertia that became Newton's First Law of Motion is attributed to Galileo Galilei. Galileo proposed the concept that an object at rest will remain at rest, and an object in motion will continue in motion with the same speed and in the same direction unless acted upon by an external force. This foundational understanding of inertia laid the groundwork for Newton's formulation of his First Law, which articulates the behavior of objects in motion and emphasizes the influence of forces on their state of motion. Newton expanded upon Galileo's ideas, incorporating them into his laws of motion, thus formally recognizing inertia as a fundamental property of matter.