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How were the Spanish sub-Kingdoms decided?

http://upload.wikimedia.org/wikiped....svg/738px-Corona_de_Castilla_1400_en.svg.png

I had assumed they were just based on the previous Taifas, but there seem to be different Taifas with different borders:

http://en.wikipedia.org/wiki/File:Reinos_de_Taifas_1080.png
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