This mosaic is in the lunette over the left central (St. Alipio) door on the West facade of San Marco.
It represents the procession when St. Mark's body was carried into the basilica. This mosaic is the oldest surviving exterior mosaic on St. Marks,
and shows the basilica in its final form, with the cupolae and four gilded bronze horses brought from Constantinople in the 4th Crusade. It dates from the 13th c.

All of the mosaics of San Marco have a unified gilded background.
The interior walls and ceiling of the Basilica of San Marco are covered with mosaics depicting stories from the Bible.
The backgrounds of the mosaic tesserae are gilded, the gold being the most precious and valuable
element worthy of representing divine images.
Since the glass is purified by fire in its manufacture, it is symbolically the purest form
to be used for holy imagery.

No photography is permitted inside St. Marks