Castilian Dual Monarchy (Duocontinental World)

The Castilian Dual Monarchy was a nation that existed in the middle age between 1050 and ~1500-1510, we cant say an exact number about its fall sincall scripts about the happenings around that time where burnt, and everyone who did know anything about it where hanged up or have been executed in other ways its capital was Arce Ezhilompe (today madrid)