As there are no Celts today, I assume you're question is about pre-Roman Gaul or southern Germany. In that case, one Gaul to another may tell their enemy, that after he took his head, above the door he'd nail it to the shed, so his ugly face might scare away the crows. And for his body, if he could only hide the smell, he will chop it up and feed it to the dogs, if they'd deem it fit enough to eat?
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