Syria, 6th century
The image is much like the contemporary
Rabbula Gospels illustration
except that it does not picture the chariot from Ezekiel 1. Christ blesses the viewer from his throne within a mandorla that four angels carry aloft. Directly below, Mary stands in orant posture. The two Apostles on her right and left could be Saints Peter and Paul.
More of the Ascension
Source: Website of Michelle Roberts