Thomas Aquinas is credited as one of the greatest proponents of natural law. During his time in Cologne he was taught by Albertus Magnus. Magnus used the teachings of Aristotle in his mentorship of Thomas Aquinas.
“Thus did the old man charge them, for he had been in many a fight, and King Agamemnon was glad. “I wish,” he said to him, “that your limbs were as supple and your strength as sure as your judgment is; but age, the common enemy of mankind, has laid his hand upon you; would that it had fallen upon some other, and that you were still young.”
Agamemnon in the Iliad by Homer