Historical documentary sources of the Mediterranean Sea region contain much information about earthquakes and associated phenomena like tsunamis. A catalogue of historical tsunamis generated by earthquakes is compiled. One of the parameters included is the tsunami intensity calculated by several authors in the past on the basis of traditional 6-point tsunami intensity scale. The historical information is re-examined and the intensity of tsunami events is re-evaluated according to the new 12-point tsunami intensity scale introduced by Papadopoulos and Imamura. An attempt has been made to establish quantitative relations between the traditional and the new intensity scales as well as between the tsunami intensity and parameters of the earthquake size like magnitude and intensity.