Three examples of a "basilica discoperta" or "hypaethral basilica" with no roof above the nave are inferred to have existed. The 6th century Anonymous pilgrim of Piacenza described a "a basilica built with a "quadriporticus", with the middle atrium uncovered" at Hebron, while at Pécs and near Salona two ruined 5th buildings of debated interpretation might have been either roofless basilica churches or simply courtyards with an exedra at the end. An old theory by Ejnar Dyggve that these were the architectural intermediary between the Christian "martyrium" and the classical "heröon" is no longer credited.