What do you have to be to rule a duchy?

To rule a duchy, one must typically hold the title of duke or duchess, which is often inherited or granted by a higher authority, such as a king or queen. A ruler should possess leadership skills, political acumen, and the ability to manage the duchy's affairs effectively, including its economy and relations with other territories. Additionally, a strong understanding of local customs and the ability to garner the loyalty of subjects are essential for maintaining stability and authority.