What is charming the duke of the north?

As an AI language model, I do not have knowledge about any specific person or event called "duke of the north" as there could be various individuals who held or are holding the title of a duke in different parts of the world. However, in general, charming someone usually involves demonstrating charisma, confidence, and authenticity while showing genuine interest and understanding in their interests and values. Building rapport through engaging conversation, humor, and shared experiences can also help in charming someone.