Etna has the longest history of documented eruptions of any volcano. The first reported eruption was in 1,500 BC.
Additional Sources of Information
Check out Italy's Volcanoes: The Cradle of Volcanology Online for more great information and images of Etna
Mauro Coltelli and Massimo Pompilio, Istituto Internazionale di Vulcanologia-Catania (Italy), email communication posted on Volcano ListServ
Bulletin of the Global Volcanism Network, 1995, Smithsonian Institution, Washington, D.C., v. 20, no. 8, p. 2.
McClelland, L., Simkin, T., Summers, M., Nielson, E., Stein, T.C., 1989, Global volcanism 1975-1985: Prentice Hall, Englewood Cliffs, New Jersey, and American Geophysical Union, Washington DC, 655 p.
Simkin, T., and Siebert, L., 1994, Volcanoes of the world: Geoscience Press, Tucson, Arizona, 349 p.