The Coronation Cathedral dedicated to the Holy Trinity and the Holy Archangels Michael and Gabriel, is a Romanian Orthodox cathedral located at 16 Mihai Viteazul Street, Alba Iulia, Romania. Built soon after and in commemoration of the Union of Transylvania with Romania, it is the seat of the Romanian Orthodox Archdiocese of Alba Iulia.The cathedral and surrounding buildings were raised in the western part of the Alba Iulia Citadel, on the site of a gatehouse near the Roman Plateau. It was thought of as a continuation of the former metropolitan seat at Alba Iulia (then called Bălgrad), where Michael the Brave built a stone church in 1597. When the citadel was rebuilt in its current form in 1713-1714, the Habsburg authorities demolished this and its materials were used to build a new church near where the railway station is today.