User blog comment:B214/Question and Answers 2/@comment-25222726-20140609113641/@comment-1359322-20140609113910

There's no fix number of servants for a peerage, it depends on the value required to revive a servant. Of course there's a maximum number of servants for both the Devil and Angel.

As to what happens to the servants if their master dies, it's unknown but the servants would probably be assimilated into another group.