Both the iconography and the proportion of the figure of Christ, tall and slender with the elegant curve of the contrapposto, the facial features, the anatomical study and the shape of the perizonium, are undoubtedly the creation of the sculptor Guglielmo della Porta.
The terracotta Christ disclosed in this study is exactly the same as the one made of silver from the Museo Aequeológico Nacional in Madrid, about 4cm smaller, and therefore belongs to the series just cited. It must be a model made by the sculptor in the first moments of his activity, around 1569, before carrying out the waxes to be cast in metal. This was the usual procedure among sculptors of his time, who proceeded to capture firs the idea in clay and then followed the different steps of the lost wax casting. If we take into account the originality of the figure of Christ created by Guglielmo della Porta and the technical perfection of the terracotta, as well as its style, we can clearly see that it is a model of the master. The way in which the cloth of purity is holded, with a visible lace on the right side, leaving part of the body uncovered, can considered the signature of the sculptor. It is this particular detail, together with the similarity of the version of silver from the National Archaeological Museum of Madrid and from the other aboved mentioned collections, that constitutes the basis of the attribution to Guglielmo della Porta.