Long ago before the long past Leaf village existed, there was a clan known as the Uchiha. There were two men of this clan with exceptional abilities in their clans bloodline known as Sharingan. They achieved such heights with this Bloodline that their power was unrivaled by even the Kyuubi Fox. But one day, somewhere in the Uchiha clans history, Madara (One of the two men) Killed his own brother and took his eyes for his own. By doing so, Madara gained immortality. But after this great dramaization, some of the clan members decided to split off and begin anew. This smaller branch of the Uchiha Clan wandered in the lands for many years watch the tides of power switch back and forth and war rage on between rising powers of the worlds Ninja.
Finding a home in a solice mountain valley, hidden from prying eyes, this smaller branch of the Uchiha clan lost some of its art and history. Though, living in this socluded place gave them a chance as the wanted. They began anew. Over years, they developed new family jutsu and forged their own history in the stones of the mountain side. But now, advances and new villages have found their way into their lands and they were discovered. Now these Uchiha of a smaller branch are spreading out and and choosing sides. Some even against their own family. Using their newly made Uchiha Clan Jutsu to craft a new name for the Uchihas.
P.S.- Because their history had slowly been lost and they spent so much time away from danger and war, the Sharingan became dilute in this branch of the Uchiha Clan. Therefore few of this Clan can now achieve Sharingan.