The round city of Baghdad in the 10th century at the time of House of Wisdom. Illustration: Jean Soutif/Science Photo Library. A wide range of languages including Arabic, Farsi, Aramaic, Hebrew, Syriac, Greek and Latin were spoken and . Shortly afterwards, a paper mill was established in Baghdad, and by the end of the 10th century, paper had replaced parchment and papyrus in the Arab world. Probably the most famous mathematician at the House of Wisdom was al-Khawarizmi, known as the father of algebra - a word derived from the title of his book, Kitab al-Jabr. House of Wisdom Caliph Haroon al-Rasheed is credited with expanding the glory of Baghdad to its greatest height during his reign from to C.E. He created an intellectual ambience by encouraging mathematicians, astronomers, scientists, and .