In feudal Japan, 権力 (kenryoku) — political power — was not just military force. It was legitimacy: the right to define who stood at the center of things, who belonged to the inner circle, who could claim to speak for the dead.

Shibata Katsuie (柴田勝家, Shibata Katsuie) understood force. Born around 1522 — making him roughly 60 years old in 1582 — he had served Oda Nobunaga for most of his adult life and had earned his nickname 鬼柴田 (Oni Shibata), Demon Shibata, through decades of hard fighting. He was the most senior of Nobunaga's surviving generals. When Nobunaga was assassinated at Honnō-ji (本能寺, Honnō-ji) on June 21, 1582, Katsuie was on campaign in the north, too far away to respond immediately. He had not been at Yamazaki. He had not avenged his lord.

That was the opening Hideyoshi (豊臣秀吉, Toyotomi Hideyoshi) had needed.

Hideyoshi was born on February 2, 1537 — age 45 in 1582 — in Owari Province, the son of a peasant ashigaru (足軽, ashigaru), a foot soldier, a nobody. He had no family name at birth. He had entered Nobunaga's service as a sandal-bearer and page around 1558. Everything he had, he had made himself, in a country where your birth determined your place and a peasant's son had no business commanding armies. And yet here he was, commanding armies.

The Kiyosu Conference (清洲会議, Kiyosu Kaigi) was called in late June 1582 — approximately six weeks after Nobunaga's death — to settle the question of clan succession. Four senior Oda retainers met at Kiyosu Castle: Katsuie, Niwa Nagahide (丹羽長秀, Niwa Nagahide), Ikeda Tsuneoki (池田恒興, Ikeda Tsuneoki), and Hideyoshi. By rights, Katsuie should have dominated. He was older, more senior, more established.

Hideyoshi reportedly entered the conference already performing grief, weeping openly in a way that subtly shamed men who had not been present to avenge their lord. Then he made his proposal: not Oda Nobutaka (織田信孝, Oda Nobutaka), Nobunaga's adult third son whom Katsuie favored and who could have exercised real authority — but Oda Sanboshi (織田三法師, Oda Sanboshi), Nobunaga's grandson, born in 1580, a toddler of 2 or 3 years old. An infant heir meant someone else would hold actual power. Hideyoshi made certain that someone was himself, securing the role of one of Sanboshi's guardians.

Niwa Nagahide sided with Hideyoshi. Ikeda Tsuneoki leaned the same direction. Katsuie was outvoted. He left the conference with his preferred candidate rejected and his political position sharply reduced.

But the conference alone was not enough. Resolutions passed in a room could be contested. What Hideyoshi needed was something visible, something the whole country could see — a declaration written not in language but in ceremony.

The funeral provided it.

Approximately one hundred days after Nobunaga's death, Hideyoshi opened a seven-day funeral ceremony at Daitoku-ji (大徳寺, Daitoku-ji) temple in Kyoto — one of Japan's grandest Zen complexes. He organized it. He financed it entirely from his own treasury. He stood at the altar as 喪主 (mōshu) — chief mourner, the role that in Japanese funeral tradition belongs to the closest family member or designated successor. Katsuie and the other senior retainers had no equivalent position in the ceremony. They were observers at best.

At the funeral's altar — before the wooden effigy of Nobunaga, the 木像 (mokuzō) that had been cremated in place of the lord's missing body — Hideyoshi personally presented the severed head of Akechi Mitsuhide (明智光秀, Akechi Mitsuhide), the man who had killed Nobunaga. He had already killed Mitsuhide at Yamazaki. Now he was presenting the proof to the spirit of the dead. Look what I have done for you. Now watch what I will do with what you left behind.

Katsuie saw all of this. According to some accounts he may have been present; whether he watched or stayed away, the political meaning was the same. The man who had avenged the assassination, called the succession council, won its argument, organized the funeral, and stood weeping at the altar had declared something in plain sight that no one could easily contradict: he was Nobunaga's heir.

The reckoning came quickly. Within months, Katsuie allied with Nobunaga's son Nobutaka and moved against Hideyoshi. The conflict ended at the Battle of Shizugatake (賤ヶ岳の戦い, Shizugatake no Tatakai) in May 1583, where Hideyoshi crushed Katsuie's forces. Katsuie retreated to Kitanosho Castle (北ノ庄城, Kitanosho-jo), set it ablaze, and died by seppuku (切腹, seppuku) within its burning walls. His wife — Oichi (Oichi-no-kata), Nobunaga's own sister, who had survived one political disaster in an earlier marriage and had been given to Katsuie as part of the post-Kiyosu political rearrangements — did not survive this one. She died in the fire at approximately age 36.

The Kiyosu Conference and the Daitoku-ji funeral together were the twin pivots on which the next century of Japanese history turned. The weapon that decided it was not a sword. It was a ceremony.