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Date Masamune is one of the more famous feudal era daimyo of Japan. Nicknamed by later generations as Dokuganryuu (one-eyed dragon) due to him having only one eye, and known for his helmet adorned with a crescent moon, he's most famous for (almost) single-handedly unifying Northern Japan with great ferocity and possessing good insight about the future, especially in regards to foreign trade, Christianity and allegiances. He was an ally of Ieyasu during the Battle of Sekigahara and later during the Siege of Osaka.

He married at thirteen and inherited his clan only a few years later, but his mother Yoshihime never approved of him due to him losing an eye to smallpox as a child. When he came to power, he decided that the Date clan shouldn't be so submissive so he went on the offensive, conquering the neighboring clans. This ended up sorta biting him in the ass as one of the clans, the Hatakeyama, decided to take his father Terumune hostage to force him to pull his forces back. When Masamune confronted the Hatakeyama, Terumune instead told Masamune to just open fire and kill him along with the Hatakeyama. Masamune did so... and then hunted down the rest of those Hatakeyama supporters and tortured them as retribution.

With his father gone, Masamune continued his conquest, hindered only by a power struggle within his family: his mother who favored his younger brother Masamichi allegedly went as far as poisoning him. In the end Masamune killed his younger brother and disinherited him for seven generations(!) so no descendant of his would be a threat to Masamune's and his heirs' position. Yoshihime fled back to her home clan and her son never saw her again (which apparently did wonders to their relationship, as they seem to have reconciled with time).

Masamune succeeded in unifying the north, but by the time he did so, Toyotomi Hideyoshi had already conquered most of Japan, so Masamune had no choice but to become Hideyoshi's vassal (though he was rather unenthusiastic about it). Under Hideyoshi's banner he took part in in eliminating the Hojo at Odawara and was rewarded, moving to Sendai (in the region that was recently ravaged by the earthquake/tsunami) as his home base and turning it from a small rural community into a prosperous city. He eventually allied with Tokugawa Ieyasu against an aging Hideyoshi, and aided him in seizing the power after Hideyoshi's death. It took a long time for him to give up his dream of ruling Japan, but after he realized he had no chance, he was a loyal and steadfast ally of Ieyasu. Although considered a Wild Card and not really trusted by anyone, Masamune did prove his loyalty and even recited a poem when Ieyasu was on his deathbed.

He kept several Christians under his protection (his daughter may or may not have converted) and encouraged travel to foreign countries, even sending a letter to the Pope trying to establish ties for a potential alliance. He was also greatly interested in cookery and art, and possessed a rather flamboyant taste, leading folk etymology to assign the kanji of his surname to the word "date" (approx. "flashy").

His lasting success, along with his unique personality, mean Masamune has remained as one of the more popular historical figures in modern Japan.

Of course, not to be confused with that sword from Final Fantasy series. That's actually named after a different Masamune.

Tropes associated with the historical Masamune

  • Bling of War: His pimped out army became a public spectacle as they traveled from the north to Kyoto to prepare for the invasion of Korea.
  • Bunny Ears Lawyer: Despite his quirky nature he was an effective leader and administrator.
  • Cain and Abel: Ended up killing and disinheriting (in that order) his own younger brother to put an end to a power struggle within the family.
  • Can't Hold His Liquor/The Alcoholic: He was rather infamous for his low alcohol tolerance, but this didn't stop him from drinking, nor from messing up by deciding on matters while under the influence.
    • Once he faked illness to avoid meeting the shogun, Tokugawa Hidetada - in reality he was nursing a hangover from hell.
  • Eyepatch of Power: Subverted - he always wears an eyepatch in fictional depictions, but there's no record of him wearing one in real life. In fact, he specifically requested that his portraits be painted with him having both eyes.
  • Headbutting Heroes: He was famously on bad terms with Naoe Kanetsugu.
  • Not-So-Fleeting Passionate Hobbies: A man of many interests, he had a great many hobbies, some of which were customary for men of his status, such as poetry and appreciation of art; and some were way out there for the age, such as cooking and taiko drumming.
  • Cool Helmet: His iconic crescent moon helmet.
  • Real Men Wear Pink: One of his many hobbies was cooking, and he liked to entertain his guests by serving them food he made himself.
  • Sadistic Choice
  • Subversion of Self-Made Orphan

Works that references Masamune

  • Samurai Deeper Kyo included Masamune who uses the nickname 'Bontenmaru' (historically his childhood name), and while a Boisterous Bruiser and ambitious, he remained as an ally of Kyo. Also he's voiced by Norio Wakamoto.
  • In Sengoku Rance of the Rance Series, Masamune is a literal one-eyed demon that looks kinda like a Peeping Eye.
  • While not appearing directly, in Persona 3, the main character's historical teacher Mr. Ono is an obvious Date Masamune fanboy. He teaches his class wearing Masamune's helmet (and probably eyepatch too) and thinks history lesson isn't cool until you get into the part about Masamune.
  • Sengoku Otome give us a gender flipped version of Masamune. Who's actually Hideyoshi's teacher in the present day, Date-sensei its later revealed that Date Masamune is her ancestor and that she and Hidayoshi End up in a world where Date Masamune did not exist for some unknown reason.
  • Date Seiji/Sage Date of Yoriden Samurai Troopers (Ronin Warriors) is explained to be a descendent of Date Masamune in supplementary materials.
  • Shogun 2 has him as a special general for the Date Clan.
  • Gate 7, CLAMP newest manga, give us a grade student as the newest version of Date Masamune. And not just that; he's a Yandere Crazy Jealous Guy towards the main character, Hana, is a Bratty Half-Pint towards anybody else and tried to kill the poor Naive Newcomer twice. But still, when he's in the battlefield, he's a hell of a good swordfighter.