Officers: prévôtés, bailiwicks, seneschals · Lands of John and Eleanor · as at first light, 1 January 1200

Seneschal of Anjou

A self-made Angevin knight, loyal to Henry II at Le Mans in 1189 and a crusader with Richard, who became the arbiter of Anjou in 1199.

He led the barons who acclaimed Arthur, took Le Mans for him and was made his seneschal; he fought beside Philip at Ballon until Philip razed the castle Arthur claimed; then he changed sides, brought Arthur and Constance to John at Le Mans on 22 September 1199, and took John's seneschalship of Anjou in place of the viscount of Thouars. On 1 January 1200 he is John's indispensable man in the Loire: he governs the counties, keeps the comital castles and holds the barony of Sablé.

Who he is

Name
William des Roches (Guillaume des Roches)
Title
Seneschal of Anjou (and of Maine), for John; lord of Sablé in right of his wife
Since
Arthur named him seneschal of Anjou and Maine in May-June 1199; he went over to John about 18 September 1199 (meeting at Bourg-le-Roi), was promised the office, and appears with the title in John's acts on 26 December 1199
Born
about 1155-1160, of a modest Angevin knightly family (Longué or near Château-du-Loir)
Family
Married Marguerite of Sablé, daughter and heiress of Robert IV of Sablé (the Templar master, died 1193); their daughter Jeanne will marry Amaury of Craon. The French Wikipedia life puts the marriage about 1190; the English one puts it in summer 1201. Follow the earlier date with caution.
Confidence
high

Dates of the switch and the title are from the two Wikipedia lives, which cite the acts.

Overlord

John, as count of Anjou

What it holds

  • The seneschalship of Anjou (with Maine; John confirmed Anjou, Maine 'and even Touraine' at Chinon, date not pinned)
  • Sablé, La Suze and Louplande in Maine; Briollay, Brion, Genneteil and Précigné in Anjou; Agon in Normandy (his wife's inheritance, administered by him; her brother Geoffrey of Cornillé lived until 1200)
  • Mayet and the forest of Bercé, granted by Arthur in spring 1199, confirmed by John in June 1200

How it was acquired

Office by Arthur's grant (1199) and John's (late 1199); lands through his marriage.

Allies and rivals

Rivals: Aimery VII of Thouars, whom he displaced as seneschal, and Robert of Turnham before him. Uneasy ally: John. Former partner: Philip, over Ballon. Ties with Juhel of Mayenne, with whom he will desert John in August 1202.

How things stand that morning

John's seneschal in Anjou and Maine and the strongest man in both; he controls the comital castles in John's name and his own barony at Sablé. Not at war that morning.

Wealth

His wife's Sablé inheritance on the Sarthe, Mayet and Bercé forest, and the profits of the seneschalship (justice, castle-guard, comital revenues).

Military

Castle of Sablé; command of the comital garrisons as seneschal; his own household knights.

Threats

  • John's distrust of a seneschal who has already switched once
  • Aimery of Thouars's resentment
  • Philip's anger over Ballon

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. 22 May 1200Le Goulet; William stays John's seneschal.Depends on: Peace holding. Stopped by: A breach between John and William.
  2. June 1200John confirms Mayet and Bercé to him.Depends on: Continued loyalty. Stopped by: A quarrel with John.

Later, on the likely course

  1. 17-25 August 1202After Mirebeau and John's treatment of Arthur he deserts John with Juhel of Mayenne; John revokes the seneschalship (24 August 1202). Far beyond the first turn.Depends on: Arthur captured and mistreated. Stopped by: John honouring his promises over Arthur.

Places of note

  • Sablé castle: His wife's barony
  • Briollay: His wife's castle in Anjou
  • Mayet: Granted by Arthur, spring 1199
  • Bourg-le-Roi: Where he met John and changed sides, about 18 September 1199

Where the sources disagree

  • The two Wikipedia lives disagree on his marriage date (about 1190 against summer 1201). The French life also places the Ballon episode around October; the English one in May 1199. Not settled here.

Evidence: His 1199 career is well documented in the chronicles and John's acts; exact days of the Ballon quarrel and of the marriage are disputed.

On the map: His office covers the whole county (drawn as Anjou and Maine); only his own fiefs are drawn here. The extent of the Sablé barony is approximate.

Primary sources for Angevin lands

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.

  • Chronicle of Alberic of Trois-Fontaines, Alberic of Trois-Fontaines (about 1227 to 1241, at the Cistercian abbey of Trois-Fontaines in Champagne). The widest net of any Latin chronicle for 1200, compiled from dozens of sources, many now lost. Read online
  • Chronicles of Saint-Martial of Limoges, Bernard Itier and other monks of Saint-Martial; Geoffrey of Vigeois for the earlier chronicle (Geoffrey's chronicle to 1184; Bernard Itier's notes about 1195 to 1225). Bernard Itier, librarian of Saint-Martial, kept dated notes through 1200 of what reached Limoges: Richard's death at Chalus in 1199, the viscounts of Limoges and the lords of the Limousin, John's passage through Aquitaine in 1200 and the affairs of Angouleme and the Lusignans, and the abbey's own elections and prices. Read online
  • Chronicles of the Churches of Anjou (Saint-Aubin, Saint-Serge, Saint-Florent and others), Various (monks of Angers and the Loire) (11th to 13th centuries; the Saint-Aubin annals run to the 1220s). The Angevin houses' own annals of the succession crisis in their city: Arthur received at Angers in 1199 with Constance and the Breton and Angevin barons, John's counter-moves, the defection of William des Roches and the Angevin lords to John, and the peace of 1200 that left Arthur John's vassal. Read online
  • The Great Chronicle of Tours, Anonymous (a canon of Saint-Martin of Tours) (about 1227). The Loire valley's view of the Angevin succession. Read online
  • Universal Chronicle of the Anonymous of Laon, Anonymous (an English-born canon of Laon) (about 1219). A Picard chronicle whose author had lived in England and keeps an eye on both kingdoms. Read online
  • Chronicle of Roger of Howden, Roger of Howden (about 1192 to 1201). The fullest single narrative for the year. Read online
  • Chronicle; Deeds of the Kings, Gervase of Canterbury (Chronica about 1188 to 1199; Gesta Regum about 1199 to 1210). The Chronica stops in 1199, so for 1200 the witness is the briefer Gesta Regum, which notes John's peace with Philip, the coronation of Isabella at Westminster on 8 October 1200, and matters touching Canterbury: the archbishop Hubert Walter as chancellor, the cathedral priory's quarrel with him, and the Lambeth college dispute lately settled by the pope. Read online
  • English Chronicle of Ralph of Coggeshall, Ralph of Coggeshall (about 1200 to 1224, in stages). Short but independent entries for 1200 from a Cistercian house in Essex: John's levy on the Cistercians and the carucage, the peace with Philip, the king's new marriage and the queen's coronation, and the death of Hugh of Lincoln. Read online

14 more in the sources library for France and Iberia.

Sources and studies

  1. Guillaume des Roches (Wikipédia)
  2. William des Roches (Wikipedia)

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