facendo una ricerca generica su questo manga di go nagai guardate cosa ho scoperto :Date Masamune
(伊達 政宗, Date Masamune?) (1567–1636) was a Japanese samurai of the Azuchi-Momoyama period through early Edo period. Heir to a long line of powerful daimyo in the Tohoku region, he went on to found the modern-day city of Sendai. An outstanding tactician, he was made all the more iconic for his missing eye, for which he was often called dokuganryū (独眼竜), or the "one-eyed dragon".BackgroundDate Masamune was the eldest son of Date Terumune, born in Yonezawa Castle (in modern Yamagata Prefecture). At the age of sixteen in 1581 Masamune led his first campaign, helping his father fight the Sōma family. In 1584, at the age of 18, Masamune succeeded his father, Terumune, who chose to retire the position of daimyo. Shortly afterwards a Date retainer named Ōuchi Sadatsuna defected to the Ashina clan of the Aizu region. Masamune declared war on the Ashina for this betrayal, but his army was halted by the Ashina general Iwashiro Morikuni, who forced Masamune to retire the campaign. Masamune took control of Obama Castle after this.
The Date family was founded in the early Kamakura period by Isa Tomomune, who originally came from the Isa district of Hitachi Province (now Ibaraki Prefecture). The family took its name from the Date district (now Fukushima Prefecture) of Mutsu Province, which had been awarded to Isa Tomomune by Minamoto no Yoritomo, the first Kamakura shogun, for his assistance in the Minamoto-Taira War (1180-85) and in Minamoto no Yoritomo’s struggle for power with his brother, Minamoto no Yoshitsune.
fonte : http://en.wikipedia.org/wiki/Date_Masamune
il manga e' del 2003 , purtroppo no ho trovato immagini a riguardo (anche se ammetto di aver fatto una ricerca forfettaria) ma e' evidente che nagai si e' ispirato a un personaggio dell epoca giapponese
un po di immagini :
diavolo di un nagai