Institution of the Sacrament of Penance
Scripture: John 20:29-33 (Post Resurrection) Matthew 16:19 "I will give you the keys of the Kingdom of Heaven..." This is probably the account intended by the artist as Jesus is depicted as Pre-Easter (note hands and feet).
This window's proximity to the Reconciliation Room should be noted.
Top window: The signs of the Papacy, founded on St. Peter, the keys and the crown once worn by the popes.