Looks like you were right... It was a skeleton from the middle ages found in Piazzetta San Michele (Volterra, Pisa) Italy, ~7 years ago:

(Google Translated Italian ->English): Meanwhile, the skeleton has been removed and prepared for restoration and placement in some deposit for possible further study. The havoc committed a few years ago by some more or less high-level managers who in the construction site of Piazzetta San Michele, despite the evidence, preferred to go on with their work without informing any competent authority of the presence of an ancient skeleton in the place remains where works for the underground services were carried out.

Source , compliments of u/Myrnalinbd