Final answer:
Prince Modupe's decree is not provided in the given information, so it's not possible to provide a detailed answer.
Step-by-step explanation:
The decree of Prince Modupe is not provided in the given information. Therefore, we do not have any specific information regarding Prince Modupe's decree. It is possible that the decree is not mentioned in the provided text or it may not be a well-known historical event. Without further information, it is not possible to provide a detailed answer to the question.