Giorgio Vasari's 16th-century fresco, "Battle of Marciano in the Chiana Valley."
Art appeciation ping.
Leonardo's Battle of Anghieri
We were in the Palazzo Vecchio in early January. I don't remember seeing the "code." Of course, I was just a tourist and I wasn't looking for it. I was overwhelmed by a plethora of rooms that looks like the one in your post.
Wow, I am flabergasted. Vasari is best known for his book The Great Master's written in the mid 1500's, which is a biography of all the great artists of the day. It has been the renaissance art bible for centuries. I wonder why he never mentioned this in his chapter on Leonardo. He worshipped Leonardo's work.
What a good mystery.