Originally Posted by Final Fantasy XIV version 1.0 Collector's Edition manual
The vast realm of Eorzea, comprising the continent of Aldenard and it's outlying islands, has seen the rise of a civilization with peoples as diverse as its environs. Throughout it's history, the landscape has played home to a number of city-states-the tenuous relations between them fluctuating from friendly to hostile and back again.
The pantheon of the Twelve is followed devoutly by most, and doctrine holds that the past wars of the realm were the wars of the heavens, with the gods and goddesses choosing nations as their respective champions. Whether because of this celestial struggle or more worldy grievances, war spread throughout the realm, discouraging unity and peace.