The Royal Library of Alexandria, or Ancient Library of Alexandria, in Alexandria, Egypt, was the largest and most significant great library of the ancient world. It flourished under the patronage of the Ptolemaic dynasty and functioned as a major center of scholarship from its construction in the third century B.C.E. until the Roman conquest of Egypt in 48 B.C.E. In Roman times, scholars used a related library called the Serapeum, located in another part of the city. This library was described as the "daughter library" and was also a temple to the god Serapis.The library was conceived and opened either during the reign of Ptolemy I Soter (323-283 BCE ) or during the reign of his son Ptolemy II (283-246 BCE). Plutarch (CE 46--120) wrote that during his visit to Alexandria in 48 BCE, Julius Caesar accidentally burned the library down when he set fire to his own ships to frustrate Achillas' attempt to limit his ability to communicate by sea. British historian Edward Gibbon attributed the library's demise to Archbishop Theophilus of Alexandria, who ordered the destruction of the Serapeum in 391.• http://en.wikipedia.org/wiki/Library_of_Alexandria---Carl Edward Sagan, Ph.D. (1934-1996) was an American astronomer, astrochemist, author, and highly successful popularizer of astronomy, astrophysics and other natural sciences. He pioneered exobiology and promoted the Search for Extra-Terrestrial Intelligence (SETI).He is world-famous for writing popular science books and for co-writing and presenting the award-winning 1980 television series "Cosmos: A Personal Voyage", which has been seen by more than 600 million people in over 60 countries, making it the most widely watched PBS program in history.A book to accompany the program was also published. He also wrote the novel "Contact", the basis for the 1997 Robert Zemecki's film of the same name starring Jodie Foster.During his lifetime, Sagan published more than 600 scientific papers and popular articles and was author, co-author, or editor of more than 20 books. In his works, he frequently advocated skeptical inquiry, secular humanism, and the scientific method.