What do castle walls, secret passages, and trusted messengers have in common with firewalls, credentials, and modern cyberattacks? More than you might think. In this talk, we explore cybersecurity through the lens of medieval warfare. By following a siege of a seemingly impregnable castle, we uncover how attackers have always thought in terms of reconnaissance, trust, misdirection, and weak assumptions. From layered defenses and outdated fortifications to insider access and clever infiltration, each element of the medieval battlefield can still be used as a modern security technique. Without getting too technical, this keynote draws parallels between sieging a castle and attacking digital systems today. It shows why strong defenses fail, how confidence becomes a vulnerability, and why the most effective attacks rarely look like attacks at all. Whether you’re curious about cybersecurity, enjoy historical storytelling, or simply want to see familiar security concepts from a new angle, this talk reveals a timeless truth: technology changes, but the art of breaking in does not.