The Wolfenbüttel ministeriales hold the moated castle on the Oker crossing south of Brunswick, the key to the Brunswick land from the Harz side.
Gunzelin is Otto IV's steward and his hardest fighter in Saxony: about 1202 he takes Peine after a feud with the bishop of Hildesheim, in 1206 he storms and plunders Goslar, and in June 1206 he besieges Lichtenberg. The Asseburg, which gives the family its later name, is built only in 1218-1223.
Who he is
- Name
- Gunzelin of Wolfenbüttel (with his father Ekbert I, if still living)
- Title
- Welf ministeriales; Gunzelin is steward (Truchsess) of Otto IV
- Since
- family seat since Widekind of Wolfenbüttel built the moated castle; Gunzelin's stewardship date not pinned
- Born
- Gunzelin about 1170
- Family
- Son of Ekbert I of Wolfenbüttel, advocate of the nunnery of Heiningen and ministerial of Henry the Lion; great-grandson of Widekind, builder of the castle. Gunzelin had three sons (Ekbert III, Burchard III, Gunzelin II) by a Hildesheim ministerial woman; how many were born by 1200 is not pinned.
- Confidence
- medium
de.wikipedia (Gunzelin von Wolfenbüttel); his stewardship from the Residenzen-Kommission entry on Otto IV.
Overlord
The Welfs (unfree knights of the house who are nevertheless great men).
What it holds
- Wolfenbüttel castle on the Oker
- The advocacy of the canonesses of Heiningen (Ekbert)
- Fiefs and rents round Wolfenbüttel and Hildesheim
How it was acquired
Family office and fiefs from the Welfs since the early 12th century.
Allies and rivals
Otto IV and his brothers; enemies: Goslar's Staufen garrison, the lords of Peine, the bishop of Hildesheim (feud about 1202).
How things stand that morning
Holds Wolfenbüttel for the Welfs. Backs Otto firmly.
Wealth
Fiefs, rents and the advocacy; the Oker crossing.
Military
Wolfenbüttel castle; the family's armed following. No figures.
Threats
- A Staufen thrust from Goslar or Halberstadt up the Oker
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.
- About 1202 (not yet)Takes Peine after a feud with Bishop Hartbert.Depends on: Welf pressure westwards. Stopped by: A Hildesheim-Welf peace.
Where the sources disagree
- The Asseburg named in the assignment is built only in 1218-1223; on 1 January 1200 the family is 'of Wolfenbüttel'.
Evidence: Family and later deeds attested; Gunzelin's office and his father's survival in 1200 not dated.
Primary sources for Welf
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.
- Annals of Egmond (12th century to about 1205). The house annals of Egmond, the counts of Holland's abbey, and the main native source for Holland around 1200. Read online
- Annals of Marbach (compiled to 1238, the section on 1198 to 1210 written in the early 13th century). Alsatian annals on the Staufen side of the Upper Rhine. Read online
- Annals of Reiner of Saint James, Liège, Reiner of Liège (1197 to 1230, kept year by year). Contemporary annals kept inside Liège. Read online
- Annals of Stade, by Albert of Stade, Albert of Stade (about 1240 to 1256). A world chronicle written at Stade in the 1240s from older Stade and Bremen annals. Read online
- Chronicle of Burchard of Ursberg, Burchard of Ursberg (about 1229 to 1230, reworked by Conrad of Lichtenau). Written a generation later by a fierce partisan of the Staufen and a critic of Innocent III. Read online
- Chronicle of Otto of St Blasien, Otto of St Blasien (about 1209 to 1210). A Swabian continuation of Otto of Freising written from the Staufen side. Read online
- Chronicle of Reinhardsbrunn; Chronicle of St Peter's, Erfurt (Erfurt chronicle in the 13th century; Reinhardsbrunn compilation about 1340 to 1349 from older annals). The two Thuringian chronicles. Read online
- Chronicle of the Slavs, by Arnold of Lübeck, Arnold of Lübeck (about 1209 to 1210). Arnold continues Helmold and writes from Lübeck, close to Danish, Welf and Baltic affairs. Read online
18 more in the sources library for The Rhineland, the Low Countries and the Swiss Lands.
Sources and studies
Last revised 4 November 2026. Published 4 November 2026. Suggest a correction on the OMNIA Discord.