Greece played a crucial role in the transmission of classical knowledge to the Islamic world and to Renaissance Italy, and also in the transmission of medieval Arabic science to Renaissance Italy. Its rich historiographical tradition preserved Ancient Greek knowledge upon which Islamic art, architecture, literature, philosophy and technological achievements were built. Ibn Khaldun once noted; The sciences of only one nation, the Greeks, have come down to us, because they were translated through Al-Ma'mun's efforts. He was successful in this direction because he had many translators at his disposal and spent much money in this connection.