What was the effect of the Mongol attack on Baghdad?

Baghdad had been established in 762 by the Abbasid Caliph al-Mansur Throughout its history it had been the capital of the Muslims, as well as the world in general. The libraries of Baghdad were unrivaled The House of Wisdom, established soon after the city was built, was a magnet for the most intelligent scientists, thinkers, mathematicians, and linguists of the world The caliphs were patrons of literature science and the arts ig