The Colossus of Barletta is one of the most important and well known bronze statues of antiquity. This monument, 5.11 metres high, hollow and of an average diameter of 90 centimeters, probably represents and eastern emporer of the end of the 4th century. The statue was supported till the year 1923 by two pins in the legs and by a third one connected to the building it leaned against. After the demolition of this buildings (1923), cracks and damages began to multiply, especially in the legs, progressively increasing with time. Restoration consisted in unloading the legs of the weight of the upper part of the statue, using a stainless steel internal structure able to transfer directly to the ground the load of the various parts of the monument. The statue has been mounted and supported by this steel structure, completely pre-fabricated on a wooden model, with the interposition of Belleville washers that allow strains from the statue to be independent of structural ones. The operation has been preceded and verified by non-destructive tests (ultrasonics, micrometers) and by destructive ones (tests on the chemical and mechenical characteristics of the resins).