Question: What is the name of the mosaic in the Basilica of Sant'Ambrogio?
Sentence: The surviving apse mosaic of the Basilica of Sant'Ambrogio, which shows Christ enthroned between Saint Gervasius and Saint Protasius and angels before a golden background date back to the 5th and to the 8th century, although it was restored many times later.
Answer in sentence: yes