Quote Originally Posted by Youjirou View Post
"Long before the times that history remembers, there was an age of great magic in an anciet land called Kiltia. When the great glood swept over the world, the culture perished, but a key to its magic and secrets -- a book called the Grand Grimoire -- is said to have survived. It it foretold that the one who holds the ancient text will be be able to change the world. Many have sought the book, but none have ever found it. Though the ages, many legends were written about the Grand Grimoire, but legends are often forgotten. Those who once knew it called it... The Final Fantasy. One day in the peaceful, snow-covered town of St. Ivalice, a young boy named Mewt discoveres a mysterious book with no title in the local bookstore. Little do Mewt and friends Marche and Ritz realize that they will soon begin the greatest adventure of their lives."

Taken from the official strategy guide. Do more research. :P
Unfortunately for you, the strategy guide isn't considered canon, since it wasn't written by Square. The description given in the instruction book is this:

"An Ancient Book:
Long before Noah built his ark, the tales tell of an ancient land called Kiltia...a world where swords and sorcery reigned.

Its learning and power were swept away in the great flood, but one clue to its secrets remained: an ancient book known as the Gran Grimoire, hidden in darkness by the powers that once were.

It is not certain how many copies of the book still exist, but it is said that whoever should hold one holds the power to change the world.

Many lived out their days searching the world for surviving copies, but none were ever found.

It was an illusion, they said. A myth-but one worth dying for."

Now, pay very close attention to the verb there. It says "holds the power to change the world." Change, not go back in time. When they go back in time, it isn't to a land called Kiltia, it is to Ivalice. No mention is made in the game of Kiltia, ever. It is not used by any of the inhabitants of Ivalice to name their world, it is never mentioned at all, save in a single line in the instruction manual.

Now, before I say anymore, I suggest you actually play the game, since they only tell you that it is based on Mewt's dreams about 200 times.