What is Agostino Vallini in relation to the place commonly known as Lateran Basilica?
Agostino Vallini:  He is also the Archpriest emeritus of the Archbasilica of St. John Lateran. Archbasilica of St. John Lateran: The Papal Archbasilica of St. John in Lateran (Italian: "Arcibasilica Papale di San Giovanni in Laterano" ), commonly known as St. John Lateran Archbasilica, St. John Lateran Basilica, St. John Lateran, or simply the Lateran Basilica, is the cathedral church of Rome, Italy and therefore houses the "cathedra", or ecclesiastical seat, of the Roman Pontiff (Pope).
Archpriest emeritus