Yes, as i thought, it largely depends on the maps, but i'm fairly sure that Galicia didn't have Coimbra in 1037. I found this map that fits a lot more with what i knew (which can be mistaken in any case):
http://mapas.owje.com/img/Espana-entre-910-y-1492-4063.jpg
Theseus, in your last map, i'm almost afraid to ask did you imagine any particular time to make a PoD that would produce that map... it was already commented, but the denomination of the different countries of Spain are easily what makes it less believable.
Regarding the borders, they are fine in the sense that they fit with the provinces, but there's one detail: provinces were a creation of the ministers during the Enlightenment, often caring little for the actual borders of the old kingdoms, like Galicia, Leon, Aragon, Valencia...
Without enlightenment it's very likely the borders of the independent territories you are imagining would not fit with the provinces. An added difficulty is that most "modern" maps of eras pre-enlightenment use the borders of the provinces for the border of the old kingdoms... so getting the real info is difficult... you need to check older maps that are very much distorted (due to cartographic rules), or dig up for modern ones with more reliable borders.
For exmple:
http://www.swaen.com/zoomamo.php?id=6998 (zoomable, you can even check the municipalities that make up the borders)
http://2.bp.blogspot.com/_yGpz3Q5FBj8/TRnatML6duI/AAAAAAAAHqY/xMS1-B9QJPE/s1600/spain.jpg (entirely unsure of why Galicia and Portugal are united here...)
An important effect of how far back you push the PoD is that NW-Extremadura can be part of Leon or not.
So, use that as you will, in your fantasy, and have fun
http://mapas.owje.com/img/Espana-entre-910-y-1492-4063.jpg
Theseus, in your last map, i'm almost afraid to ask did you imagine any particular time to make a PoD that would produce that map... it was already commented, but the denomination of the different countries of Spain are easily what makes it less believable.
Regarding the borders, they are fine in the sense that they fit with the provinces, but there's one detail: provinces were a creation of the ministers during the Enlightenment, often caring little for the actual borders of the old kingdoms, like Galicia, Leon, Aragon, Valencia...
Without enlightenment it's very likely the borders of the independent territories you are imagining would not fit with the provinces. An added difficulty is that most "modern" maps of eras pre-enlightenment use the borders of the provinces for the border of the old kingdoms... so getting the real info is difficult... you need to check older maps that are very much distorted (due to cartographic rules), or dig up for modern ones with more reliable borders.
For exmple:
http://www.swaen.com/zoomamo.php?id=6998 (zoomable, you can even check the municipalities that make up the borders)
http://2.bp.blogspot.com/_yGpz3Q5FBj8/TRnatML6duI/AAAAAAAAHqY/xMS1-B9QJPE/s1600/spain.jpg (entirely unsure of why Galicia and Portugal are united here...)
An important effect of how far back you push the PoD is that NW-Extremadura can be part of Leon or not.
So, use that as you will, in your fantasy, and have fun