The Nea Ekklesia is inaugurated in Constantinople, setting the model for all later cross-in-square Orthodox churches.
The Nea Ekklēsia (Greek: Νέα Ἐκκλησία, "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.