Alexander (Maurus) Horn was a monk, book agent, secret agent and diplomat in a time of great upheaval. Due to his activities at the Perpetual Reichstag in Regensburg, he became a persona non grata and had to operate underground for many months. He was a major player in a British intelligence network. If you see history through your glasses, you leave the negotiating tables of high diplomacy and immerse yourself in the world of seemingly secondary actors in European diplomacy.