Actually, did you leave a guard alive to give it to? If so, that might be enough to complete the quest. Just stick around for the rest of the dialogue, and you might be set.
Failing that, I think it probably is time for you to cast the mighty Reverse Time spell and head back to an older save game. The only other alternatives are to revert the game (assuming you haven't been back to town since you offed the king), or to reset the Adventure (which means starting over, albeit with much more powerful characters).
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*B*
Save Early, Save Often Save Before, Save After
Two-Star General, Spelling Soldiers
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Give 'em a hug one more time. It might be the last.
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