I want to know the answer to the following question:
Which individuals usually approved charters for universitas?
All the background I'm provided with is that "At the time of the emergence of urban town life and medieval guilds, specialised "associations of students and teachers with collective legal rights usually guaranteed by charters issued by princes, prelates, or the towns in which they were located" came to be denominated by this general term.". Is that enough to answer the question?