I ve heard of the neck thing, but this is the first time I hear about this theory. Couldn't this just be an error of the author/copier or an exaggeration useful to present Caracalla in a darker light?
That is a very possible. Though if it's true it would mean Caracalla killed his step brother Geta, who was certainly Domna's son, not his blood brother. This might make more sense as to why he did it.
EDIT: Its also mentioned in the gossip filled Historia Augusta.
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