Counts · Other imperial lands · as at first light, 1 January 1200

Arnstein

The Arnsteins hold their castle (built about 1135) on the eastern Harz edge near Aschersleben, with lands round Mühlingen and fiefs from Magdeburg and Mansfeld, and serve as sub-advocates (Untervögte) of Quedlinburg abbey.

Married into the Ascanian house, they are likely in Bernhard's and Philip's orbit, but their side is not pinned. Whether Walter III is still alive on 1 January 1200 is disputed between the sources.

Who he is

Name
Walter III, or his sons Gebhard and Walter IV: not pinned
Title
Lord of Arnstein (the family begins to call itself count at the end of the 12th century)
Since
not pinned
Born
Walter III about 1150
Family
Walter III married Gertrud, a granddaughter of Albert the Bear (so the Arnsteins are cousins of Bernhard and of the margraves). Sons: Gebhard (ancestor of the counts of Lindow-Ruppin), Walter IV (ancestor of the counts of Barby), Wichmann (later a Dominican).
Confidence
low

de.wikipedia (Arnstein (Adelsgeschlecht)) gives Walter III about 1150 to about 1196; fmg.ac (Saxon nobility) has a charter of his of 1194 and records him as living after 1199. The generations are muddled.

Overlord

Fiefs from Magdeburg, Quedlinburg abbey (they are its sub-advocates) and the counts of Mansfeld; allods round Arnstein.

What it holds

  • Arnstein castle
  • Lands round Mühlingen
  • Sub-advocacy of Quedlinburg abbey
  • Fiefs from Magdeburg and from the counts of Mansfeld

How it was acquired

Inherited and by marriage.

Allies and rivals

Kin of the Ascanians.

How things stand that morning

Hold Arnstein; side not pinned (likely with their Ascanian kin). The ADB says most of the great men of Saxony gathered round Philip at Magdeburg at Christmas 1199; whether this house was among them is not pinned.

Wealth

Rents and fiefs.

Military

Arnstein castle. No figures.

Where the sources disagree

  • de.wikipedia has Walter III dying about 1196; fmg.ac records him living after 1199. Who heads the family on 1 January 1200 is not pinned.

Evidence: Muddled generations.

Primary sources for Empire

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.

8 more in the sources library for The Rhineland, the Low Countries and the Swiss Lands.

Sources and studies

  1. Arnstein (Adelsgeschlecht), de.wikipedia
  2. Medieval Lands: Saxon nobility
  3. Otto IV.: NDB and ADB, via Deutsche Biographie

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