Machiavelli and need for unquestioned loyalty:

"Therefore, a wise prince must think of a way through which citizens will always, regardless of what the circumstances may be, need him and his power, and, as such, will always remain faithful to him." 

• Daenerys inspired this spirit of fidelity among her subjects by her continued promises to "bring peace back to Westeros", 
• to "destroy the wheel that has rolled over everyone, both rich and poor", 
• and to offer better lives to all her subjects.