Santo Stefano Rotondo (church building) built
401 CE.
Shown on the map at 41.885°, 12.497°.
The Basilica of St. Stephen in the Round on the Caelian Hill (Italian: Basilica di Santo Stefano al Monte Celio, Latin: Basilica S. Stephani in Caelio Monte) is an ancient basilica and titular church in Rome, Italy. Commonly named Santo Stefano Rotondo, the church is Hungary's "national church" in Rome, dedicated to both Saint Stephen, the first Christian martyr, and Stephen I, the canonized first king of Hungary. The minor basilica is also the rectory church of the Pontifical Collegium Germanicum et Hungaricum. Since 1985, the cardinal priest who holds the title of S. Stephano has been Friedrich Wetter.
Text from the Wikipedia article Santo Stefano al Monte Celio, licensed CC BY-SA 4.0.