Nea Ekklesia
Istanbul, Turkey · built 801
The Nea Ekklēsia (Medieval Ἐ, "New Church", known in English as "The Nea") was a church built by Byzantine Emperor Basil I the Macedonian in Constantinople between 876 and 880. It was the first monumental church built in the Byzantine capital after the Hagia Sophia in the 6th century, and marks the beginning of the middle period of Byzantine architecture. It continued in use until the Palaiologan period. Used as a gunpowder magazine by the Ottomans, the building was destroyed in 1490 after being struck by lightning. No traces of it survive, and information about it derives from historical accounts and depictions.
Church data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).