Maztica Trilogy

The Maztica Trilogy is a set of 3 fantasy novels set in the Forgotten Realms campaign setting of the "Dungeons & Dragons" fantasy role-playing game.
The series were written by Douglas Niles, and the books are:
The books are essentially a translation of the Spanish conquest of what is now Mexico in the 16th Century to the Forgotten Realms world. 
The name 'Maztica' is itself a portmanteau of "Maya" and "Aztec", two major civilizations in Central America.
The plot of the trilogy closely follows real-life events. The main character, Cordell, is similar in name to real-life conquistador Hernán Cortés. The conquistador analogs in this case worship the deity Helm and originate from the empire of Amn in the Forgotten Realms. The states of Maztica resemble the Aztecs and other mesoamericans in that:
The principal difference is the existence of magic in the "D&D" fantasy world.