It is not clear exactly where Bronn is from. What we do know for a fact is:
- He's very skilled
- Catelyn says that he
moved like a panther, and that ugly sword of his seemed a part of his arm.[1]
- Cersei thinks of him that he
was a battle-hardened killer.[2]
- He has survived a ton of calamities and battles, including:
- The Battle on The Highroad,
- The Trial by Battle VS Ser Vardys Egan,
- The Battle of The Green Fork,
- The Battle of The Blackwater
- He's in his early to mid thirties[3], born approximately between 264-268AC
- This is the only piece of extra information we have about him from author, George R. R. Martin; everything else is from the books/show
- He is a Sellsword
- He
supposedly had a rough childhood and killed for the first time before the age of twelve.[4]
The rest is pretty vague beyond that. The most likely consensus is that it doesn't matter; he is simply of low-born stock and has risen to the top - that's it. Just another example that
Power resides where men believe it resides.
- Varys
Speculations that cannot be true
He is a Faceless Man
I believe this can't be true, as Faceless Men are "in and out". They are acquire a target, plan their kill, and perform it.
There are just too many coincidences leading up to Bronn meeting Tyrion
He is Benjen
Lol.
Even glamoured, the timing just doesn't line up. Benjen would have to have gone from The Wall, to several weeks' ride beyond, then back down, and past Winterfell, and to The Crossroads before Tyrion (who left The Wall at around the same time that Benjen left).
He is Rhaegar
Nope.
He is Daario
Come on!