The Mouseion of Alexandria (Μουσεῖον τῆς Ἀλεξανδρείας; Musaeum Alexandrium), which arguably included the Library of Alexandria, was an institution said to have been founded by Ptolemy I Soter and his son Ptolemy II Philadelphus. Originally, the word mouseion meant any place that was dedicated to the Muses, often related to the study of music or poetry, but later associated with sites of learning such as Plato's Academy and Aristotle's Lyceum.
The Ptolemies reputedly established their Mouseion and Library with the intention of bringing together some of the best scholars of the Hellenistic world and collect all the books known at the time. Although it did not imply a collection of works of art, the word mouseion is the root for the modern usage of the word museum.
According to Johannes Tzetzes, the Mouseion was an institution founded by Ptolemy I Soter (c. 367 BC – c. 283 BC) at Alexandria, Egypt, though it is more likely that Ptolemy II Philadelphus (309–246 BC) saw to its completion. As a community gathered together under the protection of the Muses, the Mouseion remained supported over the centuries by the patronage of the royal family of the Ptolemies, and later by that of the Roman emperors.
Unlike the modern museum in the sense that has developed since the Renaissance, the Mouseion of Alexandria did not have a collection of sculpture and painting presented as works of art, as was assembled by the Ptolemies' rival Attalus at the Library of Pergamum. Instead, it was an institution of learning that attracted some of the best scholars of the Hellenistic world, as Germain Bazin puts it, "analogous to the modern Institute for Advanced Study in Princeton or to the Collège de France in Paris."
It is uncertain how many scholars lived in the Mouseion at any given time, as surviving reports are few and rather brief. Nonetheless, it appears that scholars and staff members were salaried by the State and paid no taxes. According to Strabo, they also received free room and board, and free servants.