Wren's earlier designs have the exterior of the church arranged with one order of columns; the division of the whole height into two orders was an immense gain in increasing the apparent scale of the whole, and makes the exterior of St Paul's very superior to that of St Peter's in Rome, which is utterly dwarfed by the colossal size of the columns and pilasters of its single order.
The exterior brick walls are divided by shallow arches and pilasters, as in other churches of Ravenna.
The cathedral, of the 12th century, has a carved portal and three apses decorated with small arches and pilasters, and contains a fine pulpit and episcopal throne in marble mosaic. Near it are two grottos 1 To the period after 335 belong numerous silver and bronze coins with the legend Caleno.
Below the pediment comes an arcade with flat pilasters, which runs all round the exterior of the church.
Giovanni Evangelista at the Frari, with its fore-court and screen adorned by pilasters delicately decorated with foliage in low relief, and its noble staircase whose double flights unite on a landing under a shallow cupola.