Final answer:
The brilliant golden display in the apse of St. Peter's known as the Cathedra Petri was created by Bernini, combining architecture, sculpture, and stained glass to celebrate the authority of Saint Peter.
Step-by-step explanation:
In the apse of St. Peter's, Gian Lorenzo Bernini created a brilliant golden display known as the Cathedra Petri (or Chair of St. Peter), which combines architecture, sculpture, and stained glass. This masterpiece, created between 1647 and 1653, marked a celebration of the spiritual authority and tradition associated with Saint Peter. Bernini's work is often identified with the Baroque style, characterized by dramatic effects, emotion, and movement, as seen in both the Cathedra Petri and his Baldacchino over the main altar in St. Peter's Basilica.