User blog comment:Kaido King of the Beasts/Chapter 801: Another Game of Thrones/@comment-24850639-20150924162103

I love it. There's a theory that Sanji is a long lost Prince from a rather important kingdom, and he ran away as a child. He's never allowed a full picture of himself on the wanted posters because he knows there are very specific people looking for him.

Jaya Arc - Sanji mentions that he knows about Noland's story from the North Blue. When he says that he was born there, he says "didn't i tell you guys?" as if he was trying to cover something up. The other crewmembers quickly call him out for never having mentioned this.

Long Ring Lond Land (something) - Sanji is the "ball man", and the hat he wears resembles vertical red & white stripes on the Lvneel Kingdom castle.

Thriller Bark - His zombie reincarnation wears the exact same hat, althouth a little bigger

Dressrosa - Noland is mentioned again, for his history with the Tontatta. The Lvneel Kingdom is shown again during Law & Cora's flashback.

Additional - Lvneel is in the North Blue. Sanji chose the name "Mr. Prince" inherently "randomly" when speaking to Crocodile on Little Garden. Just like the Chinjao family are the only Chinese references we have so far, Sanji has been the only character that frequently has French references. The only other French references made so far in the show is the family name "Montblanc", which also originates from Lvneel. We get NO explanation whatsoever how a small child with no family is just chilling on a boat trying to become a chef. Of everyone else' backstories so far, we have the least on Sanji by a LONG shot. His attitude towards women has never been explained, and things that are THAT deep-rooted ALWAYS have a cause. He ran away for a reason, and some traumatizing event involving a woman close to him is a good hypothesis as to part of the explanation.

So overall, I'm most convinced is Lvneel, but I'm pretty sure ran away from somewhere, and he was a rather valuable person in said place. Most likely a prince or royal figure. This country having an affiliation with the WG (i.e. Lvneel) would be the perfect explanation as to why they'd want Sanji back alive.