The first image is LOI's map, the middle image is a location in Sweden, but it's been mirrored.
Matthias Cronqvist's surname is, ironically enough, Swedish in origin and means "Crown Twig" -- probably a reference to noble nonroyal lineage which would make sense as the narrator calls him a knight and knights by period tradition could only come from the noble classes of Europe in most countries. Quite literally,
Lord Dracula was an actual Lord in-universe before he was Dracula. He might have actually come from Sweden at this rate, but this might also be coincidence. I've long thought Celia's cult repurposed Walter's castle, but my current line of thinking is "what if that's a castle that belonged to Mathias' family before he became Dracula?" Add in some admittedly vaguely Scandinavian design touches in the Lost Village and... it might actually be in Sweden guys.
Probably all coincidence though. My mind does so love to race.
[EDIT]
As I thought, any references to Dracula as a "Count" are A) post-Dark Lordification as Sweden has no records of any sort of [formally recognized] peerage earlier than 1280 AD or (more likely) B) a reference to the books and films that inspired the series -- he almost assuredly wouldn't have actually been a Count in-universe as the Church doesn't exactly hand out a Countship/Grafdom to the walking embodiment of Chaos that is their sworn enemy. Any noble heritage Mathias might have had in 1094 probably went WAAAAY back; possibly without any sort of formal title.
Now I seriously want to know more about this dude's family. Seriously.
[EDIT EDIT]
The rabbit hole goes deeper. At the risk of going off-topic almost completely, Knights in their present understanding only appear in the historic record at about 1200, though the concept of horse-mounted warriors in Europe goes back several centuries before that. Which would imply that first, there's a critical research failure on the part of Iga's guys here, and also that Leon and Mathias were probably among the
very first modern knights in the Castlevania universe.
SHIT.
You deduce new stuff every day, it seems.
[EDIT EDIT EDIT]
DAMMIT.
If the castle Celia used was indeed Swedish and was indeed connected to Mathias pre-vampireization, it most likely belonged to him directly as given to him by (presumably) Inge the Elder or his brother, Blot-Sweyn, depending on when it would have been granted. Under some very old laws, Castles in Sweden prior to 1300 couldn't be considered hereditary and would have been returned to the King when the current grantor died.
Long story short, it's either Walter's damn Castle, or Mathias' own pre-Drac digs.
Depending on whether or not this place is actually in Sweden. But I think either one would be MASSIVELY attractive to Celia Fortner and her Dark Lord obsessed loonies.