Charles Robertson (1844-1891) was an Orientalist painter.
Arab Traders, Cairo
In the Name of the Prophet, Alms! (1877)
The Carpet Seller (1881)
The Flower Market, Damascus
The Tombs of the Cailiffs, Cairo (1872)
[it's usually spelled "Caliph" but this is the title as given by the artist]
View of Dover