The Temple of Portunus, which stands next to the river in what was once the Forum Boarium (Cattle Market), is dedicated to Portunus, the ancient Roman god of keys, doors, livestock and ports. During the Renaissance it was known as the Temple of Fortuna Virilis.
Dating back to the 1st century BCE, its form is pseudoperipteral, in other words the temple seems to be surrounded by a colonnade, but, in fact, only the front columns are freestanding; the side columns are embedded in the walls of the cella.
In 872 CE the Temple of Portunus became the church of Santa Maria Egiziaca. In the 1920s Santa Maria Egiziaca was deconsecrated and the temple was duly restored.