Three Duchies + the royal demesne.
Atian in case you haven't gotten the green light, you have green light as The Duke of Gynfr, with the caveats mentioned in the pms
As for the count of Wexford, huuh boy, i will have to tear through several things in your app, sorry for that:
First To the East is the Ocean and then a whole lot of nothing, except for some island chains. However Argas is so far north that they certainly won't be getting in any tobacco or silks or others of those goods via a sea route. We can however assume a smaller continent being this far north in the east (to get your grand duchy sorted) but again climate wise its colder and darker and not really bringing in silk and tobacco.
Beyond Eastwards, there is mostly trade northwards especially in grain and other foodstuffs as the kingdoms who dwell farther north have difficulties with Agriculture.
Westwards there is mountains, as well as northwards and all of that is inhabited by the Mountain Tribes, who trade mostly via Risfurt with Argas or raid the countryside further north. But there are no civilized kingdoms (as far as you know) beyond those mountains.
Most trade is indeed in the South, coming up north via the Argr. Selling Southern Goods in Risfurt, staying a few days in Gynsr and then buying up Food in Arg Caeís to sell in the north is rather popular way of doing business.
And despite all of you wanting to be rich traders apparently (what with Arg Caeis being a trade hub, Gynsr being one, Risfurt being one and now Wexford to) Argas is supremely poor. It is a backwater on the arse end of the world. All it shares with the Thousand King and its former glory is the name of High Kingdom of Argas. The original capital isn't even close to were you are but indeed months and months of travel to the south.
The Kingdom isn't particularly large either, if you boat up the Argr from Risfurt to Argas you are through that in four days, probably stopping one or two days in Gynsr in between.
Okay with all of that being said, your app is excellent, but unless you make Wexford a town sitting on the mountain borders next to the Arngar there really isn't any space left for yet another Trade Hub. I mean even Risfurt being the richest place is rather poor and Gynsr being wedged between the capital and Risfurt even more so.