The 'Sallustiano' Obelisk (13.91 m), which stands in front of the church of Santissima Trinità dei Monti, arrived in Rome in the third century. It is not known which emperor commissioned its creation. What is known is that it was placed in the Horti Sallustiani (Gardens of Sallust), where its foundations can still be seen. The gardens, which covered a large area between the Porta Pinciana and the Porta Salaria, later became part of the Villa Ludovisi.
At some point the 'Sallustiano' obelisk fell or was felled. In 1735 Pope Clement XII (r. 1730-1740) had it moved to Piazza di San Giovanni, where it lay for decades. It was finally erected in 1789, by order of Pope Pius VI (r. 1775-99), in front of the church of Santissima Trinità dei Monti.