Premise: In the nave, the church's famous Byzantine mosaics show, on the left, Ravenna's fortified port of Classis, from which a procession of 22 virgins follows the three Magi with gifts for Jesus on his mother's lap; on the right, from Theodoric's palace, 26 male martyrs march towards Christ.

Hypothesis: Classis has been a port town since Roman times.
Relation: neutral