In Kingdom Hearts, Genie says that it has been 200 years since he's last heard of the Keyholes. From this we can generate the assumption that the keyblade has been around for centuries. My question is for how long has the keyblade been in existence? Where did it originate from? Who were it's first wielders? How did it's power cause the Keyblade War to occur? Somehow I want all these questions answered in a form of a new Kingdom Hearts game. Hopefully Tetsuya Nomura can satisfy my curiosity.

Currently there are no answers to any of your questions except one, the one about the Keyblade War. The war was caused by the several warriors wanted the X-Blade so they could control Kingdom Hearts and all of the worlds.

that would be cool if they did make a game off that

Its want be answered in a game

What ? do u think tytsu nomura will put kingdom hearts name before keyblade war or something like that i dont think so or maybe it is the second game that he was talking about and the first is recoded

who know but I think the first 1 was master Eragus and Master Xehanort

Well arcording to Master Xehanort:

 

Before they called the Blade for Keyblade, it was called X-blade. So the X-blade could be the very first Keyblade. And from the Xehanort report, the X-blade is part of Kingdom Hearts. But who was chosen by it? Or did it even choose anyone.

 

Since the X-blade consistes of two kingdom keys maybe there were 2 chosen keyblade wielders who each had a kingdom key.

Well, if I'm not wrong, the Keyblade Wars were fought over control of the X-Blade. The results: The Keyblade Graveyard. Other than that, I can't say anything for sure.

Bassed on what I know I can assume the Keyblade started hundreds of years ago and I'm going to assume the X-blade was the original being the most powerful. Multiple factions of keyblade wielders wanted this power and their armies went to war underneath kingdom hearts.

Master Xehanort covers the Keyblade War in his third and fourth reports.

 

In ancient times, when there were no gaps between the worlds, the worlds did not hide themselves behind walls of light unlike today, and were not protected from physically interfering with one another.

 

At that time, the worlds were overflowing with light, and there were even a great number of Keyblade wielders. However, in a world without gaps, the rush to claim the light began.

 

They unfortunately understood the original purpose for using a Keyblade. Trying to make the great heart of light called Kingdom Hearts their own, the Keyblade wielders began to wage war.

 

Kingdom Hearts can be considered the gathering place of hearts. Just like the hearts of people, worlds also have hearts. Generally, you cannot see the location of a world's heart. Hidden within each world is a door behind which lies the heart of that world. By gathering the hearts of all of the worlds into one, Kingdom Hearts can be completed.

Remember the fairy tale? It wasn't that the wielders wanted the X-blade. They wanted to claim the light for themselves, and thus the war began.

 

And the opening of the door of a complete Kingdom Hearts is said to lead to the creation of a new world. It is something which exceeds the human domain. In other words, it means that those who open the door will be reborn into something other than human.

 

Light and Dark are one in the same; there is no light which lacks darkness. The war surrounding Kingdom Hearts which was started by the Keyblade wielders enveloped even those who had taken no participation in the war. Those who were trying to protect the Light, those who were trying to support the Dark, those who were trying to mediate between the Light and the Dark, those who sought power for merely selfish reasons, all had their own expectations and as a result all became involved and the whole world became covered in darkness.

 

With this, the Keyblade War came to an end. There has yet to be anyone to open the door to Kingdom Hearts.

 

Afterwards, the worlds of today were created by the light from the few hearts that remained, and, so that war would not once again break out, each and every world hid behind their own walls.