Master; sir; -- a Turkish title of respect, applied esp. to a state official or man of learning, as one learned in the law, but often simply as the courtesy title of a gentleman.

sir, as Hassan Effendi

A man of property, authority, or education in an eastern Mediterranean country (Turkish efendi master)

Class of prosperous business and professional urban families in khedival Egypt; as a class generally favored Egyptian independence. (p. 957)