The patron saint of Rome is Saint Martina. She was martyred in 288 for not denouncing her strong Christian faith. A simple church in her honor was erected in the early 7th century. Nearly 1,000 years later, a new church was commissioned and nearly finished by 1669. Technically, the church of Santi Luca e Martina is next to and not in the Roman Forum. However, this position is where you get the best view of its dome and Ionic columns. On the right is the Arch of Septimius Severus within the Roman Forum.
