This small mosque with its quiet courtyard, just around the corner from the Şehzade Türbes, was built by a former Grand Vezir, son in law (Damat) of Ahmet III. He was from Nevşehir (there a complex built by him can be visited, but it was being restored in 2019, the building is from 1720. The part I took for a mosque started out as a Dar-ül Hasis, or School of Tradition, it was later turned into a mescit, or chapel, adding a minaret. The sebil at the corner - which used to be: a kiosk built for the dispensing of free drinking water; now they are mostly for the sale of soft drinks and ice-cream) - is described by Strolling through Istanbul, from which I quote, as very popular with painters and etchers.