The Haghia Sophia (Aya Sofya) is a church dating back to 1228-1263. It houses some very fine frescoes. It is a major sight of the city.
I am not certain what this scene may be, to the right some people are in a boat, it might be the meeting with Simmon who would later become Petrus. It's a new edit of a slide I scanned again and edited in 2018.