and founded an official school called "The Lyceum". After morning lessons, Aristotle would frequently lecture on the grounds for the public, and manuscripts of his compiled lectures were eventually circulated. The group of scholars who followed the Aristotelian doctrine came to be known as the Peripatetics due to Aristotle's tendency to walk as he taught. Aristotle's main focus as a teacher was cooperative research, an idea which he founded through his natural history work and systematic collection of philosophical works to contribute to his library. His students were assigned historical or scientific research projects as part of their studies. The school was also student run. The students elected a new student administrator to work with the school leadership every ten days, allowing all the students to become involved in turn. Before returning to Athens, Aristotle had been the tutor of Alexander of Macedonia, who became the great conqueror Alexander the Great. Throughout his conquests of various regions, Alexander collected plant and animal specimens for Aristotle's research, allowing Aristotle to develop the first zoo and botanical garden in existence. It is also suspected that Alexander donated what would be the equivalent of more than 4 million dollars to the Lyceum. In , Aristotle was forced to flee Athens with his family when the political leadership reacted against the Macedonians again and his previously published works supporting Macedonian rule left him a target. He passed on his Lyceum to Theophrastus and died later that year in Chalcis, near his hometown. History of Aristotle's library Theophrastus placed a provision in his will that left the Lyceum library, which at this point included both his and Aristotle's work as well as student research, philosophical historical texts and histories of philosophy, to his supposed follower, Neleus. However, the seniors of the Lyceum placed Strato as the next leader and upon his retirement from the school in the mid third century BCE, Neleus divorced the Lyceum from its library and took all of the books with him to Skepsis in Mysia. Neleus was an expert on Theophrastus and Aristotle, and it may be that Theophrastus hoped he would prepare a catalogue of the 10,000 rolls of papyrus. At least some of the books seem to have been sold to the library in Alexandria. In the tenth century, a catalogue of the library revealed manuscripts by both Theophrastus and Aristotle which almost had to have been obtained