Procopius records that Justinian (527-565) built a church dedicated to the Theotokos. According to another tradition Leo I (457-474) founded it before he was emperor. Zoodochos Pege=Life-giving Fount.
See:
- https://www.thebyzantinelegacy.com/zoodochos-pege
- https://www.ec-patr.org/afieroma/churches/show.php?lang=en&id=39
- http://constantinople.ehw.gr/forms/fLemmaBodyExtended.aspx?lemmaID=11780
- Andrzej Kompa, Konstantynopolitańskie zabytki w Stambule, Acta Universitatis Lodziensis. Folia Historica, Tom 87 (2011) pp. 123-214[ in pl]