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The Two Hundred Years' War (二百年戦争/Ni-Hyakunen Senso) (1914 – 2123INO/3631 – 3840PCZ) was a roughly two-century period in Fuso history following the collapse of the Jushi Okoku Jidai (十四王国時代/Fourteen Kingdoms Period) and ending with the full establishment of the Empire of Yamatai.

The Ni-Hyakunen Senso is traditionally divided into three periods:

  • Sengoku Jidai (戦国時代/Warring States Period) (1914 – 2022INO/3631 – 3739PCZ)
    • The period when most of Fuso was carved up by many dozens of warlords and daimyo competing for hegemony over Fuso or to simply maintain independence.
  • Seifuku Jidai (征服時代/Age of Conquest) (2022 – 2080INO/3739 – 3797PCZ)
    • The period following the abdication of Sakugen-tenno (昨源天皇) to Shintoki-tenno (新時天皇), after which Shintoki-tenno and his followers set out to unite Fuso under the banner of Yamatai.
  • Nademeru Jidai (宥める時代/Era of Calming) (2080 – 2123INO/3797 – 3840PCZ).
    • The period following the end of most of the major fighting of the Seifuku Jidai. By this point the only violence that remained were several rebellions against the rule of Yamatai, as well as some banditry.


For a few centuries prior to the Ni-Hyakunen Senso, the tenno of the Nadeshiko dynasty, while remaining the peacekeepers of Fuso, had been sidelined by a series of bakufu (幕府/shogunates), who kept the fourteen kingdoms – which in realty were more accurately described as power blocks of loose hegemonic confederations rather than formal kingdoms – in line under the threat of military intervention. The latest was the Takanami Bakufu (高波幕府) under the Ikuno clan (生野).

Sengoku Jidai

The period of semi-unified rule ended when Ikuno no Sasami (生野の笹身), the then Shogun of Fuso, and Mokuso-tenno (木造天皇), were both assassinated in an internal power struggle that was intended to restore power to the tenno. The coup backfired and most of the direct imperial family, including Mokuso-tenno's intended replacement, was killed in the same incident, leaving the heir to the throne uncertain.

With each of the rulers of the fourteen major power blocks suspecting each other of taking part in the atrocity, and the more ambitious of every major daimyo and samurai sensing and seizing opportunity, rebellions and war ensued and most of the fourteen kingdoms collapsed entirely. The Takanami Bakufu's authority ceased to mean anything as well and the government too collapsed. And so the lands and islands of Fuso were plunged into chaos of near perpetuate war, even the eventual enthronement of Jikken-tenno (実験天皇), a distant cousin of Mukuso-tenno, did nothing to quell the chaos; the position and authority of the tenno had been reduced to nothing and was widely viewed merely as a near-obsolete symbol.

For at least a century the daimyo and other warlords of Fuso warred with each other on and off in either an attempt to gain hegemony over as much of Fuso as possible or simply preserve independence. Many managed to conquer large swathes of territory, but these conquests never lasted long as the ruling daimyo often died before any more headway could be made, leading to revolts that caused the territories to become independent once more. A continued pattern that endured for almost a century until the rise of Yamatai.

Rise of Oda Yoshishige

Capture of Teikyo

Proclamation of Yamatai

Seifuku Jidai

Early Expansions

Arslan Invasion

Death of Shintoki-tenno

Treaty of 2080

The Treaty of 2080 (二千八十年の条約/Ni senhachijū-nen no jōyaku) was the peace treaty that ended the war between the Empire of Yamatai and the Kingdom of Mizuho, effectively ending the major fighting of the Ni-Hyakunen Senso.

Nademeru Jidai

The major fighting of the Ni-Hyakunen Senso ended with the Treaty of 2080, but localized hostilities and conflicts and small rebellions against Yamato rule persisted and continued throughout Fuso for a few more decades, even as tensions cooled to amity throughout the great islands.

One of the notable conflicts of the era was the Ashi War (足戦争), fought between the Ashi ninja clan and the imperial court.

The last serious, and largest, post-Seifuku conflict of the era was the Kurou War (黒烏戦争/Black Raven War), fought between the renegade Kurou clan and their vassals against the imperial court.


Notes & Trivia

  • The "Two Hundred Years' War," is actually a misnomer, as it was more of a series of near-constant conflict with varying periods of peace spread over three distinct periods. At no point were all faction/powers of Fuso at war with one another contemporaneously.
  • Hinomoto was the only power of Fuso to not get involved with the conflicts of the north, but did welcome refugees fleeing the wars. This occasionally led to disputes with some clans when they accused Hinomoto of sheltering their enemies, but none of the accusations held any real merit.
  • The Sengoku Jidai of the is mostly inspired of the real-world Sengoku period of Japanese history.