The first documentation of the Oratory dates to 1181 but the building originates from earlier times, as demonstrated by a section of wall in Roman brick. It may have been used as a hospitium, a place for pilgrims and other guests. In the 14th century the building was expanded and frescoed: the only pieces remaining from these decorations are the three Madonna's. The presence of a giant foot of St. Christopher to the left of the large arch of the presbytery documents the cult of this saint, appropriate to a zone surrounded by swamps, where travel was difficult. The 17th century wooden altar includes a frontal by Jacopo Palma il Giovane depicting The Holy Trinity and Saints Joseph, Francis, Lucy and Margaret. To the sides are two statues: a polychrome stone St. Christopher and a polychrome wood St. Lucia. The left wall shows a painting on canvas, dated to 1760, with female figure, possibly an Allegory of the City of Padua. On the interior wall of the facade there is a canvas depicting Antonio degli Oddi giving the bishop's insignia to his successor and cousin Daniele degli Oddi. In the presbytery are tombstones with the arms of the Da Ponte and Conti families, and another tombstone in the nave bears the arms of the Zabarella. A Roman crematory urn serves as a holy water font and other Roman fragments decorate the walls. The bell tower is from the 12the century - after a series of modifications it was restored to its original appearance in 1928.