What was the vestibule of Old St.Peter's in Rome called?

Name: What was the vestibule of Old St.Peter's in Rome called?
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The vestibule of Old St. Peter's in Rome was called the narthex. The atrium refers to the open courtyard in front of the church, while the nave is the central part of the church where the congregation sits, and the apse is the semicircular space at the end of the church where the altar is located.

What Was the Vestibule of Old St