Premise: In the apse of the Greek-columned interior is a delightful mosaic of St. Apollinaris, Ravenna's first martyr and bishop, surrounded by 12 sheep representing the Apostles, with Moses and Elijah in the clouds above him.

Hypothesis: Ravenna's first bishop and martyr was St. Apollinaris, depicted here in a delightful mosaic.
Relation: entailment