[quote=@Inkarnate]
<Snipped quote by AtomicNut>
And a heavily taxed Walder Frey has the stone, iron, and vision how exactly? 

<Snipped quote by Abefroeman>
Jocelyn is a Westerosi name, actually.

[url=https://awoiaf.westeros.org/index.php/Jocelyn_Baratheon]There's a few precedents.[/url]
[/quote]

The vision is something he earned around the travels after losing his leg. Stone and Iron are paid by whoever owns the castle... coz if not, no mason would ever work.