Faraway Moses was the name given of the Constantinople guide, The
Innocents Abroad Chapter 35.  He was actually an Jewish-American, a
partner in the company that held the concession rights for tourists.  He
had also made an appearance at the Chicago Worlds Fair and appears on at
least one of the souvenir postcards.  His real name was Harry Mandil.
In at least one of the references I've found claims that he was the
guide through The Holy Land, not just Constantinople.  The name Faraway
Moses only occurs at the beginning of chapter 35.  Did he in fact
accompany the Quaker City Excursion through the Holy Land, in particular
the trip from Beirut to Damascus?  It's reported that he was one of the
wealthiest men in Constantinople and might have viewed this novel
expedition as an excellent marketing opportunity. And, that leg of
Twain's trip was quite luxurious, in terms of the dragoman's services.