The mortars are an artificial product obtained since ancient times using natural materials. Different types of binders can be obtained trough a baking process of a carbonatic rock or a carbonatic rock plus a natural, or not, hydraulic products or a chalk stone. The binders, when mixed with aggregate and water, undergo hardening. The oldest mortars date back to 12.000 years B.C. and were used for the construction of floors in Palestine and Turkey; over the centuries the use was extensive by the Egyptians, Greeks, Etruscans, Romans. The latter introduced the mortar into the architecture around the end of the III century B.C.; then, their use was increasingly frequent. Starting from the XIV century, during the Humanistic period, this material was widely used, mainly influencing the architecture of the Renaissance. The use continued in the following centuries with the realization of artificial stones. and the use, also in Firenze, of cements.