Chapter 4
In the Year XXX, it is noted that Tobirama Senju disappeared during a mission and was declared dead by the Elders of Konoha and that was reluctantly agreed to by the Clan Head, Hashirama Senju who never again spoke about his last sibling.
In that same year, Madara Uchiha was married to a person with a family name of Blessed and a given name of Asahi. His brother Izuna married Asahi’s twin sister, Asami, in the same ceremony.
The next year, the Hidden Village of Konoha was formed with various clans living in their own districts.
In the final journal of Mito Uzumaki, wife of Hashirama, she wrote that she and Hashirama were never introduced to, or even met, the spouses of Madara or Izuna despite over forty years of friendship.
Tsunade Kato, eldest daughter of Hashirama Senju and Mito Uzumaki, wrote in her journals that while the Uchiha were enthusiastic founders and well-respected shinobi of Konoha, no Senju were permitted to enter the Uchiha District until after the deaths of Madara and Izuna Uchiha and their respective spouses.