The building has an unusual square plan, consisting of two independent churches (one, underground, is the current
crypt), two apses on the southern and eastern walls, and a medieval monumental portal with two side lions, facing the road entering Manfredonia. The interior, with four pillars, dates to the 11th century, and once housed the icon of the Holy Virgin of Siponto (Italian:
Maria Santissima di Siponto), dated to the 7th century. The icon is now in the
Manfredonia Cathedral, as well as the polychrome wood Byzantine statue of "La Sipontina" (6th century) The underground church dates to the early Middle Ages, and was replaced by the upper one after having been destroyed by an earthquake. ==See also==