The monumental stairway of 138 steps was built with French diplomat Étienne Gueffier’s bequeathed funds of 20,000 scudi, in 1723–1725, linking the Bourbon Spanish Embassy, and the Trinità dei Monti church that was under the patronage of the Bourbon kings of France, both located above — to the Holy See in Palazzo Monaldeschi located below. The stairway was designed by architects Francesco de Sanctis and Alessandro Specchi. [Ref. Wiki]
My first job after school, before and during my first year of university, was at a lovely little Italian cafe in Dublin called “Steps of Rome” - best (authentic) pizza in the town!