Always existed and always will exist, conflicts between the samurai clans and ninja families. For times, Shogun financed the military expeditions of the samurai and supported the agricultural maintenance of ninjas. However in certain era, samurai feel superior because imperial links and slowly began a conquest of the land ninjas.
Without the Shogun's interference, ninjas gone be cornered because it lacked the military power compared with samurais. In the form of counter attack, the families ninjas blocked the agricultural supplies for the rest of the empire, which was very difficult times. Hunger and misery ravaged the land of Izumo, then the Shogun had to interfere in this conflict. Coming to close the war and establishing boundaries. This did not prevent small conflicts that still occur.
In 250 BC, the imperial family had begun to lose its lineage, this time the Carp's Clan was best suited to succeed the throne. However the ninjas did not support this self dictatorship, because the Carp's Clan was one of the greatest ninjas inquisitors. This time that the things began to change. Kaede Hamada, leader of Eagle's Clan discovered one ore able to make their swords unbreakable. This changed the course of the war. With the support of the families ninjas quickly Hamada's popularity grew, but maybe not in the time required to exchange the Shogunate.
With countless conflicts scattered Izumo, Sakuradite was quickly inserted into the everyday population, whether in war, whether in secular life. Source of energy and money, this ore was to take over the shogunate's hands from Hitoch Kaoshi, supreme leader of the Carp's Clan.
A few months of the transfer of the Shogun's power, sellers silk from Nama Family found traces of Sakuradite in the Warlands. Hamada immediately reported to Hitama Kakochi , leader of Crane and arch enemy of the Carp. Hitama funded a millionaire expedition to the Warlands with the intention to discovering if the rummors about Kaoshi really distributing Sakuradite by other continents.
On the day of the procedure between the Shoguns, Hamada and Hitama invaded the imperial city, taking the throne and overthrowing the Carp's Clan forever. Hamada supported by the ninja families raised the Eagle's Clan for cutting, becoming the fourth Shogun promoted the clan of Izumo in 303 BC. In 322 BC, Kiria Kaoshi become Shogun, descendant of the ancient imperial family and the Eagle's clan, this time already admitted with royal blood.
During these 80 years on the throne changes, the conflict eased. Focused on the extraction of sakuradite, the 7 Ninja families and 5 Samurai clans were moved to set up their capital in large sources of this ore, and appointed by the emperor own extraction and in different areas of application for Sakuradite.
Already at the end of your domain, Kaoshi determined the Sakura Law, that prohibited the marketing of Sakuradite with other continents. In 342 BC trying to eliminate the high rates of smuggling of the ore the Scorpion's Clan was appointed guardian of the law. Peacetime always been a thread of destruction, current Mamoto Mohio, ruler of the imperial city is sick and still in 416 BC still does not have a firstborn successor. This creates tension in families and clans because the Ascension of a samurai clan can be one of the next decisions of the emperor, less than Mamoto Kuiky eldest daughter to take the throne and assume the position of empress.