An Heir Named Because There Was No One Else
By early 1591, Toyotomi Hideyoshi's succession plans had collapsed twice in quick order. His younger brother and closest lieutenant, Hidenaga, died on February 15 of that year, and that summer his own infant son, Tsurumatsu, died at age two. With no adult male heir left in the family, Hideyoshi turned to his nephew, Hidetsugu, the son of his elder sister Tomo, adopting him and elevating his court rank through the fall. By December 1591 Hidetsugu had been installed as kanpaku, imperial regent, taking over the Jurakudai mansion in Kyoto and, on paper, the day-to-day governance of Japan while Hideyoshi turned his attention to the invasion of Korea.
The arrangement had an unstated expiration date built into it from the start. In 1593, Hideyoshi's concubine Yodo-dono, who had already lost one infant son, became pregnant again, and she gave birth to a boy, Hideyori, at Osaka Castle on August 28, 1593. According to the Tokitsune-ki, the diary of court noble Yamashina Tokitsune, Hideyoshi was overjoyed and rushed from his military headquarters in Kyushu to see the child. He also began floating a plan to have the infant Hideyori betrothed to one of Hidetsugu's own daughters, so that Hidetsugu would still, eventually, hand power to a Toyotomi bloodline heir. It was a compromise that let Hideyoshi avoid an immediate decision, and it did not last.
A Coup Even Contemporaries Doubted
At the end of June 1595, rumors surfaced that Hidetsugu was plotting to overthrow Hideyoshi. Ota Gyuichi, the chronicler best known for his detailed biography of Oda Nobunaga and generally regarded as a reliable source for the period, recorded in the Taikosama Gunki no Uchi that "rumors of an anti-Hideyoshi faction, centered around Hidetsugu, surfaced, and falconry was an excuse to meet in the mountains and plot an overthrow," a story he judged far-fetched, hard for people of the time to credit even as it circulated. On June 26, Hideyoshi's magistrates, including Ishida Mitsunari, arrived at the Jurakudai and demanded Hidetsugu submit a written oath denying any ulterior motive. He complied with a seven-page denial, an episode also recorded independently in the Ietada Diary of retainer Matsudaira Ietada, which historians treat as a reasonably solid contemporary record.
The case against Hidetsugu kept shifting rather than solidifying. A round of large donations to the Imperial court, initially read as an attempt to buy influence, was later argued by some researchers to have actually come from Hideyoshi himself, not Hidetsugu, a detail that undercuts one of the accusation's own pieces of evidence; the money was returned to Hideyoshi on August 5. A separate, unverified report that Hidetsugu had secretly contacted the powerful daimyo Mori Terumoto surfaced on July 5, and an account of an attempted hostage-taking of Tokugawa Hidetada is treated by historians as unreliable. Whatever the underlying facts, Hidetsugu was summoned to Fushimi Castle, denied an audience with Hideyoshi, and ordered into exile at Mount Koya, a mountain monastery traditionally used to remove the nobility from political life.
Seppuku at Mount Koya
Hidetsugu shaved his head and entered Seigan-ji Temple on Mount Koya, his escort reduced from the 200 to 300 horsemen who had originally accompanied him down to eleven pages after Ishida Mitsunari objected to the size of the retinue. On August 20, 1595, three inspectors sent by Hideyoshi, Fukushima Masanori, Ikeda Hideo, and Fukuhara Nagataka, arrived at the temple with troops and announced that Hidetsugu had been ordered to commit seppuku. He did so that day, and three of his personal attendants, Yamamoto Tonoma, Yamada Sanjuro, and Fuwa Bansaku, died with him. Hideyoshi had the Jurakudai, Hidetsugu's mansion and the seat of his brief regency, torn down, and had his severed head put on public display in Kyoto.
What makes the sequence of events harder to read as a genuine judicial process is the timing of what happened to Hidetsugu's family. His wives and concubines were rounded up and imprisoned on the evening of August 8, twelve days before Hidetsugu himself was put to death and while the investigation was still nominally underway. They were transferred under guard to Kameyama Castle in Tanba province on August 16, four days before his seppuku. Their fate, in other words, appears to have been settled well before any final determination of Hidetsugu's own guilt.
Thirty-Nine People at the Sanjogawara
On September 5, 1595, sixteen days after Hidetsugu's death, Hideyoshi ordered his entire household destroyed. At the Sanjogawara, a dry riverbed execution ground in Kyoto, 39 people were beheaded: his two wives, at least eight concubines, several of his sons and daughters, and a number of waiting women attached to the household. The killing reportedly took about five hours. Among the dead was the teenage daughter of the powerful daimyo Mogami Yoshiaki, who had only just arrived in Kyoto to become one of Hidetsugu's concubines and had not yet even been formally introduced to him when she was executed alongside the rest of the household. Her death did not stay a private grievance: five years later, at the Battle of Sekigahara in 1600, the Mogami clan fought against Toyotomi loyalist forces, and later accounts of the clan's motives point directly back to what happened to her at the Sanjogawara.
Not every child died. Hidetsugu's one-month-old daughter, Kikuhime, was adopted out to a relative of her grandfather and survived; another daughter, later known as Ryusei-in, was spared and eventually became a concubine of the samurai Sanada Yukimura. The bodies of the executed were buried in a mound at the riverbank, but a subsequent flood washed the site away, and the graves now recognized as Hidetsugu's family's resting place sit instead at Zuisenji Temple in Kyoto, where a stone monument still marks the clan's collective grave.
The "Life-Killing Kanpaku" Reputation
Hidetsugu's posthumous reputation in Japan for centuries rested heavily on his nickname sessho kanpaku, the "life-killing regent," earned from rumors that he had personally killed hundreds of people for sport, sometimes cited as a specific claim of a thousand killings. Modern historians doubt the rumors are accurate: someone in Hidetsugu's position committing killings on that scale would have generated far more independent documentation than survives, and the accusations cluster suspiciously in the same narrow window as the succession dispute rather than building up over his several years as regent. One alternate explanation researchers have floated is that Hidetsugu, an enthusiastic student of swordsmanship, was involved in appraising Hideyoshi's large sword collection, work that period practice sometimes carried out through test cuts on the bodies of condemned criminals, a legitimate if grim contemporary custom that later rumor may have inflated into an unprovoked killing spree.
Mary Elizabeth Berry's 1982 biography of Hideyoshi, still a standard English-language academic account of the period, is part of a broader scholarly reading of the purge as less about genuine treason than about Hideyoshi clearing every rival claim to the succession while he still could. The purge cost Hideyoshi more than a nephew: it removed the last adult male member of the Toyotomi clan besides Hideyoshi himself, and it alienated daimyo like the Mogami who might otherwise have had reason to support Hideyori's eventual rule. Hideyoshi himself died three years later, in 1598. Forcing a threatening subordinate into self-killing was not unique to Hidetsugu's case: three and a half centuries later, Erwin Rommel was likewise forced to take poison, though in his case the regime covered the death up with a fabricated story about a war wound rather than admitting what had actually happened. The extermination of Hidetsugu's household is generally counted among the events that hastened the Toyotomi clan's own collapse, the same kind of rapid unraveling that followed Attila the Hun's death, when a revolt shattered Hunnic control within about a year. Hideyori, the son whose birth had set the purge in motion, would not survive Toyotomi rule for long either: the family he was meant to secure the succession for was destroyed by Tokugawa forces at Osaka Castle in 1615, in the same decades-long collapse the Sengoku period's other famous swordsman, Miyamoto Musashi, spent his own career navigating as a ronin with no master to serve.