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"As clearly understood from the simile expression such as "equivalent to" and "same as," the word "sengoku no yo" as used by court nobles at that time directly denoted the Zhanguo period in ancient China. "In the article for Apin "Gohojoji Hisamichiko Ki," a diary of Hisamichi KONOE, it is described as "Same as in the Zhanguo period. In the section "Shugo (provincial military governor) should give high priority to honesty" in "Shodanchiyo" by Kaneyoshi ICHIJO, it is described as "the term of office for kokushi (provincial governor) was four years a term and although the present shugo corresponds to kokushi in the former time, they are equivalent to the Twelve Feudal Lords in the Chunqiu period and the Seven Influential Lords in the Zhanguo period, because they govern and succeed the fief from father to son. The word origin was the expression "sengoku no yo (period of warring states)" by the court nobles at that time comparing the troubled social conditions since the Onin Disturbance to the troubled times in the "Chunqiu and Zhanguo periods (Spring and Autumn period and the Warring States period)" in ancient China. Such strong control by sengoku daimyo over their own territory is called a daimyo-ryogoku system (the system in which daimyos control feudal domains). Sengoku daimyo repeated battles among them almost constantly and strengthened the tendency to rule monitically (centralized control) land and people in their own territory. The power of the bakufu had been significantly weakened, and sengoku daimyo (Japanese territorial lords in the Sengoku Period) emerged in various places all over Japan.
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Sometimes, a part of the Muromachi Period or from and after Nobunaga's visit to Kyoto is segmented as the Shokuho (Azuchi-Momoyama) Period.
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The Sengoku Period in Japan (from around 1493 (or 1467) to around 1573) is a chronological period in the history of Japan that commenced from the Coup of Meio in 1493 or the Onin Disturbance in 1467 and ended by the disappearance of the Muromachi bakufu (Japanese feudal government headed by a shogun) with the purge of Yoshiaki ASHIKAGA by Nobunaga ODA, the fifteenth shogun, of the Muromachi bakufu, in 1573. Sengoku Period (period of warring states) (Japan)
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