Forum Romanum, Rome. View from the Palatine Hill to the church San Teodoro al Palatino, Arch of Septimius Severus, Curia Julia, church Santa Maria Antiqua and Temple of Antoninus and Faustina.

Church San Teodoro al Palatino is a 6th-century church in Rome. It was dedicated to Theodore of Amasea and given to the Orthodox community of Rome by Pope John Paul II in 2004. It and is located on an ancient road between the Roman Forum and Forum Boarium, along the north-western foot of the Palatine Hill. It may first have been built as early as the 6th century in the ruins of the granaries of Agrippa. The unusual round shape suggests it may have been built into the ruined shell of a temple similar in construction to the well-preserved nymphaeum once identified as the Temple of Minerva Medica. An ancient pagan altar was placed in the atrium in front of the church, and an early Christian mosaic was found on the site. The apsis mosaic dates to the 6th century and shows Christ (in black clothing with gold lati clavi, which on Roman garments indicated high rank) seated on an orb representing the heavens. The Capitoline Wolf was kept in this church until the 16th century.

Santa Maria Antiqua (English: Ancient Church of Saint Mary) is a Roman Catholic Marian church in Rome, Italy, built in the 5th century in the Forum Romanum, and for a long time the monumental access to the Palatine imperial palaces.
Located at the foot of the Palatine Hill, Santa Maria Antiqua is the oldest Christian monument in the Roman Forum. The church contains the earliest Roman depiction of Santa Maria Regina, the Virgin Mary as a Queen, from the 6th century. Built in the middle of the 5th century on the north-western slope of the Palatine Hill, Santa Maria Antiqua is the earliest and most significant Christian monument within the Roman Forum. The church contains a unique collection of wall paintings from the 6th to late 8th century. The discovery of these paintings have given many theories on the development of early medieval art and given distinctive beliefs in archaeology. The church was abandoned in the 9th century after an earthquake buried the buildings; it remained sealed for over 1000 years until its rediscovery in the early 1900s. Therefore, Santa Maria Antiqua represents a key element for the understanding of the cultural and urban development of the Roman Forum from Antiquity into the first centuries of the Christian period.

more on https://en.wikipedia.org/wiki/San_Teodoro,_Rome , https://en.wikipedia.org/wiki/Santa_Maria_Antiqua , https://en.wikipedia.org/wiki/Temple_of_Antoninus_and_Faustina , https://en.wikipedia.org/wiki/Curia_Julia , https://en.wikipedia.org/wiki/Arch_of_Septimius_Severus , https://en.wikipedia.org/wiki/Roman_Forum , https://de.wikipedia.org/wiki/Datei:Map_of_downtown_Rome_during_the_Roman_Empire_large.png http://dlib.etc.ucla.edu/projects/Forum/reconstructions/ForumRomanum_1