Who consolidated the Masso Leopoldino?

The consolidation of the Masso Leopoldino was designed by the architect Alessandro Doveri, under the Grand Duke Ferdinand III of Lorraine. Work began after the collapse of 1801, which had destroyed houses and the church of Santa Caterina. The project aimed to stabilize the tuff rock and secure the district built at its foot.

A useful clarification: the name can be confusing. The worksite, undertaken around 1820, was practically completed in 1821, then the works were continued or finished under the reign of Leopold II. It is to the latter that the name "Masso Leopoldino" refers, but the initiative for the great worksite belongs to Ferdinand III and the design to Doveri. The intervention notably lowered and leveled the summit of the rock, later laid out as a terrace. So, if you ask who consolidated it in the sense of the architect responsible for the project: it is Alessandro Doveri ; if you mean the Grand Duke who had it built, it is Ferdinand III.