The Temple of Romulus is located in the Velia area in Rome and was built between the Temple of Antoninus Pius and Faustina and the Basilica of Maxentius.
The round brick building, its dome and its two side rooms, each with its own entrance and apse, were combined with the remains of the Templum Pacis to form the church of SS. Cosma e Damiano in the 6th century and integrated as the vestibule of this church. This explains the good state of preservation. Its richly decorated main entrance is flanked by two porphyry columns. The temple is closed by the original, antique bronze door, the lock of which is still working.