From the Politico obit of Senator Byrd:

It’s not a stretch to say that he wrote the book on the Senate — he authored a four-volume history of the upper chamber — which is why so many of his younger, more energetic colleagues continued to defer to him when it came to Senate rules and procedures. “We will remember him for his fighter’s spirit, his abiding faith, and for the many times he recalled the Senate to its purposes,” Senate Minority Leader Mitch McConnell (R-Ky.) said Monday morning. “Generations of Americans will read the masterful history of the Senate he leaves behind, and they will also read about the remarkable life of Robert Carlyle Byrd.”

Indeed, you could say Byrd used the Senate floor to test out his galley proofs, since the volumes all more or less started as addresses on Senate history to his fellow members. He also wrote a volume on the history of the Roman Senate.