Saint Robert Bellarmine grew up in a very devout Catholic family. In fact, his great uncle was Pope Marcellus II. When Robert was 18 years old, he went to seminary to become a priest. He grew quite famous for his wonderful homilies. Later, he became the rector (or leader) of the Roman College. He was such a fine scholar, writer and devoted servant of God, he was eventually elevated to cardinal.
A priest must be very wise in order to be chosen by the pope to become a cardinal. Once he is made a cardinal, he wears a special cassock with red piping and a red hat called a zucchetto. (The pope wears a white one.) Over at Catholic Icing, you’ll find easy directions to make a red cardinal zucchetto in just a few minutes using felt and hot glue.