Pius II.

Pius II, a significant Renaissance humanist and pontiff, authored the only autobiography ever written by a reigning Pope: his "Commentaries." These memoirs chronicle his life and thoughts, offering a unique perspective on his era. Prior to his papacy, he also produced notable erotic writings, showcasing the breadth of his intellectual and creative pursuits. His work provides invaluable insight into the mind of a man who led the Catholic Church, bridging secular and spiritual realms.