Muhammad was considered a prophet and, thereby, seen as a wise leader.
In addition, they felt that he could settle any issues that would arise
between the people inside of the cities. In addition, this allowed for
more jobs to be created from the newly settled towns, which gave
security to the townsfolk.
B:
Agriculture, water projects, shipyards all offered steady work to people driven out of the plains states.
The order helped by acquiring wealth to ransom Christians who were taken by Non-Christians during the crusades. Many crusaders were captured and countries had to pay huge amounts of money for them which was often not worth it. The trinity was established to help the crusaders by getting those people home.