What was Sanada Yukimura's real name?

His documented historical name was Sanada Nobushige (真田信繁). 'Yukimura' appears in later sources and may be a posthumous name or popular attribution. He is known by both names today, with Yukimura being far more famous.

Why is Sanada Yukimura famous?

He is famous for his defense at the Siege of Osaka (1614-1615), particularly the Sanada-maru fortification in the Winter Siege, and for his nearly successful direct attack on Tokugawa Ieyasu's headquarters in the final battle. He died fighting and became a symbol of loyal, brilliant last-stand resistance.

Did Sanada Yukimura almost kill Tokugawa Ieyasu?

In the final battle of the Summer Siege (June 1615), Sanada's forces reportedly drove Ieyasu's headquarters troops into disarray and Ieyasu himself reportedly considered suicide at one point. The story comes from accounts sympathetic to both sides; the degree of actual danger to Ieyasu is debated.

Sanada Yukimura: Japan's Greatest Warrior?

Sanada Yukimura — or more accurately, Sanada Nobushige — is remembered in Japanese tradition as the greatest warrior of his era: the man who nearly changed history at Osaka Castle in 1615, who fought with genius and died with honour. The historical reality is extraordinary enough without embellishment.

The Name Question

His documented historical name was Sanada Nobushige (真田信繁). “Yukimura” (幸村) appears in later sources — possibly a posthumous name, possibly a popular attribution that grew in later centuries. He is known today almost exclusively as Yukimura; both names are used in this entry. [history] [legend: origin of “Yukimura” name uncertain]

Background

Nobushige was the second son of Sanada Masayuki, a clever Sengoku daimyō who controlled Ueda Castle in Shinano province. Masayuki had a talent for strategic ambiguity — he twice resisted Tokugawa Ieyasu at Ueda Castle (1585 and 1600), on the second occasion delaying Ieyasu’s march to Sekigahara. At Sekigahara, Masayuki and Nobushige chose the western (losing) side while the elder son, Nobuyuki, sided with the east — a deliberate family split to ensure one branch survived regardless of outcome. [history]

After Sekigahara, Masayuki and Nobushige were exiled to Kudoyama in Kii province (modern Wakayama), under comfortable but supervised confinement. Masayuki died in exile in 1611. Nobushige remained at Kudoyama until 1614. [history]

The Siege of Osaka (Winter 1614)

When Toyotomi Hideyori — Hideyoshi’s son, still in Osaka Castle — called for support against Tokugawa pressure, Nobushige escaped from Kudoyama and joined the Toyotomi cause. His options were limited: he was on the wrong side of history, with no domain, no future under the Tokugawa order. Osaka was his last chance. [history]

He brought innovation. For the Winter Siege, he designed and built the Sanada-maru — a fortified outwork projecting from the castle’s southern wall, essentially an independent fortification protecting the main castle’s most vulnerable approach. When Tokugawa forces attacked the Sanada-maru, they were repulsed with significant losses. The Winter Siege ended in a negotiated peace — but as part of the peace, the Sanada-maru and other outworks were filled in, which fundamentally weakened the castle’s defences. [history]

The Summer Siege and Death

The Summer Siege (1615) began when the peace negotiations broke down. Osaka Castle, stripped of its outer defences, was far more vulnerable. The Toyotomi forces made a final stand in the open. [history]

Nobushige led a direct assault toward Tokugawa Ieyasu’s headquarters. Contemporary accounts — from both Tokugawa and Toyotomi sources — agree that his forces reached Ieyasu’s immediate vicinity and that the situation was extremely dangerous for the seventy-two-year-old Ieyasu. Some accounts say Ieyasu was prepared to commit suicide at one point. The degree of actual risk remains debated. [history] [legend: specific details of Ieyasu’s distress come from accounts with varying degrees of reliability]

Nobushige was killed in the fighting on 3 June 1615, reportedly by an enemy warrior who recognised him. His red armour — the distinctive red (aka) equipment of the Sanada clan forces — had made him visible. He died fighting. [history]

Why He Became a Legend

The combination of the factors made him irresistible to later tradition: the wrong side, the brilliant tactics, the near-victory against overwhelming odds, the honourable death. He became a symbol of loyal resistance and skilled last stands — the warrior who could not win but showed everyone how to lose magnificently. [legend]

He appears in hundreds of novels, plays, films, manga, and video games. The 2016 NHK taiga drama Sanada Maru was named after his fortification. His red armour has become one of the most iconic images in Japanese popular history.