Some comments.
guarded the Wady Mousa and exacted tribute form all who visited Petra
Petra is very likely the hiding place of the remnant of Israel who escape the soon-coming satanic Islamic World Ruler ("the beast") as spoken of in the Books of Matthew and Revelation in the Bible. The Wady Mousa and the "Treasury" of Petra have been featured in movies including "Indiana Jones and the Last Crusade".
The Wady Musa is an amazingly narrow entrance and the only way into Petra. The Bible indicates that when the forces of this crazed satanic "beast" tries to follow the Jews to kill them, this narrow entrance will somehow be made inaccessible (Rev 12:14-16).
It’s a really cool historic site. My mother and her globe-trotting old ladies have been there.