Thomas Aquinas

Saint Thomas Aquinas (c. 1225 – 7 March 1274) was a philosopher and theologian. He is best known for writing the Summa Theologiae.

Apologetics
Aquinas offered five "proofs" of the existence of God (originally called the quinque viæ):
 * 1) The unmoved mover
 * 2) The uncaused cause
 * 3) The cosmological argument
 * 4) The argument from degree
 * 5) The teleological argument