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In the 11th century, the Caliphate of Córdoba collapsed, fracturing into a series of petty kingdoms (Taifas),[5] often subject to the payment of a form of protection money (Parias) to the Northern Christian kingdoms, which otherwise undertook a southward territorial expansion. The capture of the strategic city of Toledo in 1085 marked a significant shift in the balance of power in favour of the Christian kingdoms.[citation needed] The arrival from North Africa of the Islamic ruling sects of the Almoravids and the Almohads achieved temporary unity upon the Muslim-ruled territory, with a stricter, less tolerant application of Islam, and partially reversed some Christian territorial gains.