Basilica of Saint Apollinaire in Classe, wall mosaic decoration, apse half-dome: cross clypeus, detail of Transfiguration. Christ is represented by the jewelled cross framed in the blue clypeus, which is decorated with 99 golden stars; god’s figure is depicted on the small medallion on cross centre. Inscriptions are on clypeus extremities: Greek word “ixzus” is on top, Latin expression “salus mundi” is under cross base, Greek letters alpha and omega are beside cross branches.