According to the historian John William Draper, this is a sense of what life was like under Al-Rashid's rule, during the period of the caliphs, the learned men of the Christians and the Jews were not only held in great esteem, but were appointed to posts of great responsibility and were promoted to the high-ranking jobs in the government. He, Caliph Harun Rashid, never considered to which country a learned person belonged, nor his faith and belief, but only his excellence in the field of learning. And to get a sense of how much learning and how advanced the knowledge began to be, especially under the rulership of Al-Rashid, during this time, he was a contemporary of Charlemagne, who was the Frankish king. He was also the first Holy Roman emperor, and so it's this region right over here. And they were trading gifts, and this is a historical account. Harun Al-Rashid sends Charlemagne this water clock, and it's so foreign to the Franks, to Charlemagne, that he thinks that it must be some type of magic, that it can't be explained by just normal means. And then things really get invested in, in terms of collecting knowledge, as we get into the rule of Al-Rashid's son, Al-Mamun, where he creates in Baghdad what is called the House of Wisdom, which is this center of learning of mathematics, astronomy, physics, medicine, geography, and map-making, poetry, philosophy.