Greater Youmu dispute
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The Greater Youmu dispute (Aizawan and Komashi: 大妖夢紛争, Dai Youmu funsō) was a territorial dispute between the former Komashi confederal states of the Principality of Aizawa and the Grand Duchy of Azura-Nishi over the region of Greater Youmu, with the conflict extending as far back in the Domain Wars period.
Prior to formal and hostile conflicts, the region of Greater Youmu had been under the administration and control of Aizawa, through its great predecessor, the Kingdom of Aizawa, and considered to be the first nation in all of Komashi. When the nation-state of Shikoku broke apart in the 15th century that caused the devastating Domain Wars, Aizawa, the sole monarchy remaining, maintained control of Greater Youmu, but feudal domains in contemporary Azura-Nishi asserted that the region belonged to them. Aizawa refused recognition of their claims, and when the domains banded together to attack the region, Aizawa retaliated and dismantled the clans during the Aizawan involvement in the Domain Wars, with the help of the Mogatsu Domain.
On the onset of the First Komashi Confederation's founding, the new, official nation-state and grand duchy of Azura-Nishi was created. Reaffirming its stance of preceding domains, Azura-Nishi asserted that Greater Youmu was theirs. This dispute persisted until in 1865 when the Grand Duchy of Azanami brokered the Treaty of Oda that asserted Aizawa's control of the upper half of the region but not its entirety. The treaty was met with extreme opposition and resentment in Aizawa that was amended in the Zakusei Agreement of 1892, brokered by Azanami as well, which was to create a condominium on the entire region, between the two governments.