There are seven side chapels in the interior of the basilica, the first five dedicated to the most important Benedictine Saints.
The Corridor of the Martyrs connects the new basilica with the Little Chapel of Santa Maria, where the Body of St. Prosdocimus lies. It is a rare example of early Christian art, datable between 480-510.The existing building dates from the 16th century and is the last of the three to be built on the spot. A paleochristian basilica, probably of modest propotions, built immediately after the Edict of Tolerance (313) to hold the hallowed Tomb of the Martyr Justina. The second basilica built from the foundations in honour of St. Justina, while today building was built by Andrea Moroni and completed in 1580 by the Istrian architect Andrea da Valle (Bale in croatian, small townlet nearby Rovinj). a

