[Quote=Brand]
When they hear news that a child of Arthur Blackwater is still alive, they would likely rally together to put a Blackwater back on the throne. Although Lucien is technically the heir, the fact that he betrayed his kingdom means no one wants to see him on the throne. Which could raise some interesting angles with him possibly trying to start a faction, maybe mostly mercenaries, to reclaim the throne. That however would require a great deal of money which he doesn't have.
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I figured no one would automatically know he betrayed him, and would just think he died. When they see he'd alive, I figured he would lie about it and make up some sort of story about beung captured or whatnot. Of course the story would fall apart as soon as he used Necromancy, which he might be careful to avoid around certain people at first.