4He painted himself in the Sistine Chapel

Michelangelo put his signature on the Pietà.

But after that he never signed another work of art. Instead, he would often paint himself into them. The most famous of these self-portraits is in The Last Judgment fresco that covers an entire wall of the Sistine Chapel. There, St. Bartholomew is holding the skin of a face that appears to be Michelangelo’s.