"the hagia sophia the greatest and most sacred piece of the city during the byzantine age and today is a museum. This is another beautiful mosaic showing Emperor Constantin Monumachus IV, Christ and Empress Zoe."
The Byzantine Monuments website offers this:
Hagia Sophia’s south gallery. Mosaic depicting the Empress Zoe (1028-1050) and her third husband, Constantine IX Monomachus (1042-1055), presenting to the enthroned Christ a bag containing gold coins and a scroll inscribed with a list of donations. The composition, along with another dedicatory mosaic panel placed next, illustrates in a most eloquent manner, the association of the Byzantine Emperors with the Great Church.