The Triumphal Arch at Santa Maria Maggiore: Left side

5th century
Mosaic
Basilica of Santa Maria Maggiore

Top register: The Annunciation and Joseph's Dream.
Second register: The Adoration of the Magi.
Third register: The Slaughter of the Innocents.
Bottom register: The Apostles as sheep at the gate of Jerusalem.

Detail images:

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View the entire arch.
Read more about the Annunciation, St. Joseph, the Magi, and the Slaughter of the Innocents.

Photographed at the basilica by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.