in 4e the king is just as likely to be a level X minion where X is whatever the DM decides makes sense. Maybe the king is a noble and trained with weapons and he's a level 14 minion.
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The head of the wizard's guild could be a high level wizard. He could also be a guy that has a really high Arcana skill and is really good at politics and doesn't know squat about combat spell casting, though he might still know some high level rituals etc. Again he could be a minion, though probably a fairly high level one, as he really doesn't know anything about fighting.
I would question a DM having a King minion unless the plot of the story was for an Assassin (or the PCs) to definitively and easily kill the King. Otherwise, I'd question making the King a minion (who is he a minion of? why is he cannon fodder?).

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.