Question: What is the building that was built by Pope Sixtus IV and where the Papal conclave occurs?
Sentence (from "Della Rovere"): Coming from modest beginnings in Savona, Liguria, the family rose to prominence through nepotism and ambitious marriages arranged by two della Rovere popes, Francesco della Rovere, who ruled as Pope Sixtus IV (1471–1484) and his nephew Giuliano (Pope Julius II, 1503–1513).
Relevant evidence: No