Originally from Madrid, currently living in Trenton, NJ.
By the way Tracy, I'm also from Vallecas, and the story about the "Valle del Kas" is just that, a story.
It comes from the leyend of "el moro Kas", but it isn't truth.
I think people like the story of the moro Kas, because it makes the origin of Vallecas more interesting, and that's why they spell it with a K, but to me is just plain irritating. I'm vallecana with C (y a mucha honra).
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Angela