I have tried to find information on whether there are any formal requirements that must be filled for a person to get titles like ayatollah and hoyatoleslam. I have also found references to a "grand" or "great" ayatollah. (My translation from Swedish.) I am interested in short descriptions of any formal requirements, if different in different countries, if there are more titles of a similar kind, how you think they should be transcribed (hoyatoleslam, hoyatuleslam, hoyatolislam, hoyatulislam etc.)