Final Fantasy Tactics is one of my favorite games. A while back, a campaign setting write up for this universe appeared on the Paizo.com forums (link). The write up was a combination of house rules and fiction (some fan, some ripped from the game itself). Some of the fiction also included lore from other “Ivalice” games: Final Fantasy XII, and Vagrant Story. It was amateur, but it was appealing.
I took what had been created and formed it into something you might see from a 3rd-party publisher. I added lore from all the Ivalice games, including Final Fantasy Tactics Advance, and A2 Grimoir of the Rift. The whole package requires a ton of rewriting and editing, but here’s a sample chapter to tide you over.