David Davies 
Cuauhtémoc [EPUB ebook] 
Descent of the Sun Priests

Starts with Cuauhtemoc’s flight  down to the City of the Emperors; the eagles
he meets along the way, a truly memorable landing wherein he tries
desperately to keep from flying into his Emperor; his destruction of
three pirate ships; his eventual marriage to beautiful young girls and
eventual promotion to Emperor.  Not all on the same day; of course!