What kind of Christianity did the man who constructed the Basilica of St. John practice?
Justinian I: Justinian I ( ; Latin: "Flavius Petrus Sabbatius Iustinianus Augustus" ; Greek: Φλάβιος Πέτρος Σαββάτιος Ἰουστινιανός "Flávios Pétros Sabbátios Ioustinianós" ) ( 482 14 November 565), traditionally known as Justinian the Great and also Saint Justinian the Great in the Eastern Orthodox Church, was the Byzantine (East Roman) emperor from 527 to 565.
i don't know