Quote Originally Posted by Aedile Rich
What person is it?

Normally it's either your faction heir or faction leader... if this is the case, just treat it as the same mission for the current one.
The mission said "your heir" however it named the king by name. I had both the new king and the heir join the crusade. Didn't work. I decided to just suck it up and press on. I didn't get ex com'd, but they did send an inquisition.