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Wait a minute...
Edward the Third was an Arthuriana nerd who named his son after Sir Lionel, and...
...made up a title for him, which....
...had previously existed in Arthuriana and didn't refer to a place. Coincidence?
Probably.
Well, darn. That would've been very interesting. Then again, maybe the knowledge that Edward III was such a nerd he named his son after Sir Lionel is enough to ask.