Hereditary lords · The Kamakura house and its housemen · as at first light, 1 January 1200

Miura Yoshizumi

The Miura are the greatest house of the Sagami coast.

They held the Miura peninsula (the district of Miura, with the old castle at Kinugasa) before Yoritomo came, were the first of the Sagami houses to ride to him, lost the old head Yoshiaki at Kinugasa in 1180, and furnished the boats and mariners of Yoshitsune's fleet at Dan-no-ura in 1185. Yoshizumi, the head, is old, a member of the Thirteen and, as we recall, constable of Sagami. His son Yoshimura leads the younger generation.

In the Kajiwara affair the Miura took the lead: Yoshimura is said to have gathered the sixty-six names. The Miura 'fleet' of the campaign board is the real thing in the sense that the peninsula's coast was manned by mariner-warriors who served in Kamakura's sea business, not that a navy existed. On the likely course (below) Yoshizumi dies about 9 February 1200, and the house under Yoshimura supports the Hōjō through 1205 and 1213 until the Hōjō destroy it in 1247.

Who he is

Name
Miura Yoshizumi
Title
Head of the Miura; constable (shugo) of Sagami (recalled); member of the Thirteen; on the likely course he dies 1/23 (about 9 February 1200)
Since
head since his father Yoshiaki died in 1180 at Kinugasa (recalled)
Born
1127 (about 72 or 73)
Family
Son of Miura Yoshiaki; his son Yoshimura (b. about 1168, recalled) succeeds him. The Wada are a branch of the Miura (Wada Yoshimori is a cousin). The English Miura page names Yoshiaki, Yoshizumi (at Dan-no-ura, 1185) and Yoshimura (1221).
Confidence
medium

English Wikipedia (Miura clan); the brief for the date of death. The constable's post and the Kinugasa history are recalled.

Overlord

Yoriie

What it holds

  • The Miura peninsula (Miura district) with the old castle at Kinugasa
  • The Sagami constable's post (recalled)
  • Boats and mariners on the Miura coast
  • A seat in the Thirteen (ends with his death)

How it was acquired

By inheritance from the Taira-descended local lords of Sagami; rewarded by Yoritomo for early support.

Allies and rivals

Allies: the Wada (their branch), Chiba, Hatakeyama, the Hōjō. Rivals: Kajiwara (broken by the petition, though alive on 1 January), later the Hiki.

How things stand that morning

Yoshizumi is old (on the likely course he dies about 9 February, five or six weeks on); Yoshimura is already the active man.

Wealth

Peninsula lands, the fisheries, the shore trade. No figure.

Military

The Miura retainers and the coast's boat-warriors; no numbers.

Threats

  • Yoshizumi's death
  • A Hōjō-Miura rivalry that does not yet show

What the year holds

What happened next, if nothing in play changes it. Each event carries what it depends on and what would stop it.

In 1200

  1. Shōji 2/1/23 (about 9 February 1200)Yoshizumi dies; Yoshimura heads the house and the constable's post.Depends on: Natural death Stopped by: Nothing in play stops a natural death; only a change in the person's circumstances (illness cured, flight, removal) alters the date, and the campaign rules on that.

Later, on the likely course

  1. Kennin 3 to Genkyū 2 (1203 to 1205)The Miura side with the Hōjō against the Hiki and Hatakeyama (Yoshimura kills Shigeyasu at Yuigahama on Genkyū 2/6/21).Depends on: Hōjō policy Stopped by: A Hiki victory

Places of note

  • Kinugasa castle: The old Miura castle (Kinugasa-jō), where Yoshiaki died in 1180

Where the sources disagree

  • The campaign board puts Kinugasa at 35.25, 139.63 (Yokosuka): it is near the Kinugasa castle site, which is the right place; its note 'whose peninsula fleet is Kamakura's navy' is a mood, not a fleet.
  • The English Miura page says the clan was destroyed by Hōjō Tokiyori in 1247 (the Hōji battle) and ruled the peninsula until Hōjō Sōun took Arai castle in 1516.

Evidence: Yoshizumi's death date is the brief's; the rest is thin in English sources and recalled.

"The campaign board" is OMNIA's working map. These notes record where its earlier claims were checked against the sources.

On the map: Only the peninsula is drawn; the constable's reach over the rest of Sagami was an office, not a block.

Primary sources for Kamakura regime

Chronicles, registers, sagas and inscriptions written in or near 1200 that cover this entry. Each has its own page with editions, translations and where to read it.

  • Hundred Times Refined Extracts: court annals (late thirteenth century, from court diaries). Short dated annals of the imperial court excerpted from courtiers' diaries, among them the Gyokuyo and the Meigetsuki. Read online
  • Mirror of the East, Anonymous; compiled by officials of the Kamakura shogunate (compiled about 1300 from the shogunate's records, diaries and family documents). The Kamakura house's own chronicle, in daily entries. Read online
  • Jottings of a Fool: an interpretative history of Japan, Jien (慈円) (about 1219 to 1220, revised to about 1223). A history by Kujo Kanezane's brother, head of the Tendai school and the leading churchman of the court, written to explain the fall of the Kujo and the rise of the warriors as the working of principle (dori). Read online
  • Diary of the Inokuma Regent: the diary of Konoe Iezane, Konoe Iezane (近衛家実) (1197 to 1218, as a daily diary). The diary of the regent's heir, aged twenty-one in 1200 and already a senior courtier under his father Konoe Motomichi, who was regent (sessho) for the child emperor Tsuchimikado. Read online
  • Leaves of Jade: the diary of Kujo Kanezane, Kujo (Fujiwara) Kanezane (九條兼實) (1164 to 1200, as a daily diary). The diary of the former regent, Yoritomo's ally at court, who had been driven from power in the Kenkyu purge of 1196 and lived in retirement in 1200. Read online
  • Record of the Bright Moon: the diary of Fujiwara no Teika, Fujiwara no Teika (藤原定家) (1180 to 1235, as a daily diary, with gaps). The diary of the poet and courtier, then thirty-eight and a middle-ranking official of the Kujo house. Read online
  • Surviving Documents of the Kamakura Period, Various; collected by Takeuchi Rizo (竹内理三) (documents of 1185 to 1333, collected and printed 1971 to 1997). The collected charters, deeds, court orders, shogunal directives, temple records and land registers of the Kamakura age, printed in date order. Read online
  • The Tale of the Heike, Anonymous; traditionally attributed to Shinano no Zenji Yukinaga, performed and reshaped by blind reciters (early thirteenth century in its first form; the standard Kakuichi text was fixed in 1371). The epic of the Genpei war, in the form the reciters gave it over the century after 1200. Read online

Sources and studies

  1. KJA_BRIEF.md and the OMNIA board for sheet kja (the lead's notes: [own] computation, [not yet checked against the source] recollection, [en] English Wikipedia)
  2. Azuma Kagami (the Kamakura chronicle), Kenkyu 10 to Shoji 2 entries, recalled and through the brief; ja.wikipedia and ja.wikisource were refused in this session, so no entry was re-read
  3. Jeffrey P. Mass, Warrior Government in Early Medieval Japan (1974), from memory; the archive.org full text could not be opened
  4. English Wikipedia: Miura clan (read this session; thin)

Last revised 4 November 2026. Published 4 November 2026. Suggest a correction on the OMNIA Discord.