Who made cosmological argument?

The cosmological argument is not so much an argument itself as a style of argumentation concerning the theoretical necessity for a first member for any series dependent upon time. It was put forth by Aristotle as an argument for a Prime Mover in book 12 of his Metaphysics. The argument itself, however, may be older than Aristotle. St. Thomas Aquinas later popularized it as an argument for the existence of God which, though it does not prove the being of a benevolent and intelligent creator, comes as close to proving God's existence as Aquinas thought secular reasoning to be capable.