Saint Thomas Aquinas (1225-1274)

He was an Italian Dominican friar and Catholic priest. He was an immensely influential philosopher, theologian, and jurist in the tradition of scholasticism.

In Chesterton's portrayal, Saint Thomas is a mysterious man who was born into a rich family, but despite that, decided to live a humble life of a friar.

Because Thomas was quiet and didn’t speak much, some of his fellow students thought he was slow and called him the dumb ox, but he was a man of rare brilliance who started a revolution in Christian thought.

He was given the title Doctor of the Church by the Catholic Church for having made a significant contribution to theology and doctrine through his work.