These pictures were taken in a corridor or series of adjacent rooms, number 11 on the ground plan, where there were several graves on either side with extensive frescoes.

I have been informed this represents Archangel Michael OR the Angel of the Lord

Located in the top section of the arch, above the icon of the ‘Crucifixion’.
Byzantine fresco from the 12th century.

Correspondent: J.M.Criel, Antwerpen.
Source: Website of ‘stnicholascenter.org’ .