The House of Wisdom (Bayt al-Hikmah) was built first as a library where the books on the sciences of the Ancients were kept. Under the sponsorship of the Caliph Al-Ma'mun (813-833), it developed into a scientific institute where the books on Ancient Greek philosophy were translated into Arabic. The Caliph acquired many Greek manuscripts and generously supported the translation activities in the House. By the end of the century, Arabic translation of the major works of the Greek philosophy and science had been completed. Thus, the Caliph and his House paved the way for the rise and flourish of Islamic philosophy and science.