The martyrdom of hundreds of christians thrown alive into the fire during the reign of roman emperors Valerian (Valerien) and Gallienus (Gallien). 3rd century.- The walls of the church are decorated with frescoes by Niccolo Circignani (also called Pomarancio) (15th cent.) and Matteo da Siena (16th cent.) portraying 34 scenes depicting the persecution of Christians in the Roman Empire.- Basilica di Santo Stefano Rotondo al Celio (Basilica of St. Stephen in the Round on the Celian Hill - Eglise Saint-蓆ienne-le-Rond)Construction: 5th century. Celian Hill; Rome; Italy (2020)