Let me guess. It's the fourth most holy place in Islam. Holy enough to kill for.
"The mosque itself was built on the site of the earlier cathedral of St Vincent which was demolished by Cordoba's Muslim rulers following the Islamic invasion and occupation of parts of southern Spain in the eight century."
Throughout history, this is what muslimes do. They invade a country, destroy its sacred sites, build a mosque (like the dome of the rock)on the site of the destroyed temple and claim it a sacred muslim site. These people are relentlessly demanding and the lowest of the low. They deserve no respect from any other religion or culture.