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 by knowledgeable viewer Gerard Vroeijenstijn (whom I thank; translation mine) this fresco represents St. Nicolaus saving the life's of three generals (stratilates).
The frescos depicting the life of St. Nicolas (and the legends about him), in the northeast aisle arcade of the church, date from the 12th century. They are the only surviving ‘St. Nicolas cycle’ in Turkey.
Correspondent: J.M.Criel, Antwerpen.
Source: Website of ‘stnicholascenter.org’ .