Battistero degli Ariani

A few steps off Ravenna's main shopping street, a squat brick octagon hides a dome that should not exist: the baptismal ceiling of a lost Arian cathedral, built for the Gothic court's own faith, where Christ stands young and unarmoured in the Jordan while twelve apostles carry their crowns towards an empty, jewelled throne.

Why it matters

The Arian Baptistery is a rare surviving baptistery built for an Arian Christian community, and UNESCO included it in the 1996 inscription precisely because its mosaics keep iconographic details that reflect Arian principles. King Theodoric had it raised at the end of the fifth century as the liturgical counterpart of his Arian cathedral next door, during the years when his palace basilica and mausoleum were also rising. When Justinian's officials returned the city to Catholic orthodoxy, the building was reconsecrated and much of its decoration was removed — what remains is therefore a rare document of a defeated confession, preserved by neglect and later luck. The Ministry of Culture now manages it as one of Ravenna's state monuments.

What to notice

• The dome medallion: a young, nude Christ immersed to the hips in clear water, John the Baptist beside him, and the river Jordan personified as an elderly god watching from the bank — a scene almost identical to the Neonian Baptistery's, which invites direct comparison.
• The ring of twelve apostles moving towards a great gemmed throne topped by a cross and draped with a purple cloth: the empty seat awaiting Christ after the Last Judgement.
• The purple drape itself — the municipal portal suggests it may be read as an Arian emphasis on Christ's humanity, exactly the doctrine that separated the Goths from Rome.
• The building's strange proportions: the floor lies far below the street, because the structure was originally nearly three metres taller and the city has risen around it; remains of the outer ring corridor survive in small reconstructed sections.
• The coolness of the interior after the street: a sober brick octagon, deliberately modest, whose only surviving decoration is that dome.

Context and history

Theodoric's religious policy tolerated parallel Christian confessions, and his court practised Arianism, which held the Son subordinate to the Father. The baptistery served the Gothic cathedral nearby, and its mosaic was made in two phases: the baptism scene almost certainly under Theodoric, with much of the apostle ring redone after the mid-sixth-century Byzantine reconquest. When the Arian community was dissolved, the building became a Catholic oratory, and in 1914 it passed to the Italian state; what had been stripped elsewhere — the decorative revetment, the silver, the altars — was simply never replaced, leaving the dome as the sole surviving programme. UNESCO's brief synthesis groups it with the other seven monuments of the city as testimony to the artistic contacts between the Western and Eastern Mediterranean in the fifth and sixth centuries.