Viscounts · Duchy of Brittany · as at first light, 1 January 1200

Rohan

The viscounty of central Brittany on the upper Blavet and Oust, with Rohan, Pontivy and Guéméné: poor upland, but a great family on the rise.

Who he is

Name
Alan IV of Rohan, called the Young (Alain le Jeune)
Title
Viscount of Rohan, lord of Guéméné
Since
1195, on the death of his father Alan III
Born
1166 (aged about 33)
Family
Son of Alan III of Rohan; his son Geoffrey (born about 1190) succeeds in 1205 and will marry Constance's daughter Margaret.
Confidence
high

French Wikipedia list of the viscounts.

Overlord

The duke of Brittany

What it holds

  • Rohan castle
  • Pontivy and the upper Blavet
  • Guéméné
  • Baud

How it was acquired

Inherited 1195.

Allies and rivals

Neighbour of Porhoët (Josselin) and of the ducal Broërec.

How things stand that morning

Holds his viscounty under the duke; quiet.

Wealth

Upland cattle, forest, tolls on the Blavet.

Military

Castle of Rohan; his knights.

Places of note

  • Rohan castle: Seat
  • Guéméné: Lordship

Where the sources disagree

Evidence: Holder and dates from the viscount list.

On the map: Approximate.

Primary sources for Brittany

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.

  • 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
  • History of the Dukes of Normandy and the Kings of England, Anonymous of Bethune (a clerk in the household of Robert VII of Bethune) (about 1220). A Flemish lord's clerk writing twenty years on, with a soldier's interest in who fought whom. Read online
  • The Acts of Philip Augustus, with Delisle's Calendar, Various (the French royal chancery) (1179 to 1223). The king's own charters and treaties for the year: the peace of Peronne with Baldwin IX in January 1200, the treaty of Le Goulet with John on 22 May 1200, the marriage settlement for Louis and Blanche, the privilege for the scholars of Paris, grants to towns, abbeys and Norman lords, and the first acts of the king's new acquisitions in the Vexin, Evreux and Berry. Read online

Sources and studies

  1. Liste des vicomtes de Rohan (Wikipédia)

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