Santa Bibiana is a small Baroque style church. The church façade was designed and built by Gian Lorenzo Bernini, who also produced a sculpture of the saint holding the palm leaf of martyrs.
According to an ancient, not documented tradition, the church was built in 363 by Roman matron Olimpina on the house where, during the supposed persecution of emperor Julian (361-363), Bibiana, her mother Dafrosa and her sister Demetria would have suffered martyrdom.
On the other hand, according to the Liber Pontificalis the church was erected in 467 under the pontificate of Pope Simplicius. Pope Leo II (682-683) moved there the relics of Martyrs Simplicius, Faustina and Viatrix from the Generosa Catacombs. The same Pope built in the surroundings (iuxta Sanctam Vivianam) a church consecrated to Saint Paul, no longer extant. The church was restored by Pope Honorius III in 1224.
The present facade was designed and built by then 26-year-old Gian Lorenzo Bernini in 1624-1626, as commissioned by Pope Urban VIII. The columns lining the nave are from the original 5th-century church.
The bodies of St Bibiana (Viviana or Vibiana), her mother Dafrosa and her sister Demetria were discovered inside a 3rd-century sarcophagus, and now rest inside an alabaster urn under the major altar. The column just inside the church is said to be the one Bibiana was strapped to.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.