Barons and castellans · Other imperial lands · as at first light, 1 January 1200

Ahaus

A free lordship round the castle of Ahaus in the western Münsterland, near the Twente border.

Who he is

Title
Lords (Edelherren) of Ahaus
Since
not pinned
Born
not pinned
Family
The heiress Adelheid of Ahaus later brings the lordship to Otto of Horstmar (lord 1227-1246).
Confidence
low

Known here only through the later Horstmar inheritance.

What it holds

  • Ahaus castle and lordship

Allies and rivals

Neighbours: Horstmar, the bishop of Münster, the Twente (nld).

How things stand that morning

Exists as a free lordship; nothing more pinned.

Wealth

Manors.

Military

Castle.

Threats

  • The bishop of Münster

Where the sources disagree

Evidence: Inferred from the later Horstmar-Ahaus marriage.

On the map: Castle district only.

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. Horstmar, de.wikipedia

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