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The figures portrayed in the main fields are: Christ enthroned giving his blessing (top left); Mary enthroned (top right); St Paul (middle left); St Peter with Eugenius IV kneeling at his feet being given the keys (middle right); the martyrdom of St Paul (bottom left); and the martyrdom of St Peter (bottom right).
The iconography of Christ, Mary, Peter and Paul in the principal fields follows Early Christian traditions.
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