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Al-Masudi was a prolific writer, and authored over 20 works on a wide range of topics, including history, geography, literature, and religion. His most famous work is the Muruj al-Dhahab wa Ma'adin al-Jawhar, which is an encyclopedia of world history. Al-Masudi's writings were influential in the development of Islamic thought, and he is considered one of the most important historians of the Middle Ages.