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"March 712
In Toledo, while Christians were praying for deliverance from the
Moslems on Palm Sunday, the Jews opened the gates for the Moslem
invaders under Tarik. This marked the end of the Visigothic rule in
Spain and the beginning of one hundred and fifty years of peace. Thus
began a golden age in which for the most part Jews were able to study
what they wanted. The Iberian caliphate was independent of Baghdad
and encouraged the flowering of Spanish-Jewish culture, while it was
at the same time being suppressed by the Baghdad caliphate."
http://www.wzo.org.il/en/resources/view.asp?id=268