After long lasting fights, Peace of Lodi in 1454 brought a certain degree of peace and stability to the region (Mattingly, 1955: 77). Most noteworthy aspect of Peace of Lodi was that it institutionalized the functional equality among Italian city states. In other words, regardless of their size, power and location, Italian city states came to a consensus in which they are all treated and assumed equivalent to each other. At this point, it should be noted that the principle of functional equality can be considered as the main constituting element of modern diplomacy. In fact, diplomatic interaction between two political entities only started after the mutual acceptance of equivalency by both parties in the medieval and Renaissance Europe. In this regard, the institutionalization of equality through Peace of Lodi accelerated the emergence of diplomatic customs as a legitimate practice in Italian Peninsula.