William I of Guelders
He succeeded in Guelders through the rights of his mother Maria during a contested succession, securing a new territorial position for the House of Jülich. He died without legitimate descendants and was succeeded by his brother Reginald IV.
This complete profile is available in English. Bibliographic titles retain their original language. Links marked ES open the Spanish edition.
Key details
Birth: 1364 Pending review
Death: 1402 Pending review
Role: Duke
Dynasty: Jülich · ES
Territories: Guelders (ES) · Jülich (ES)
Recorded relationships
Sources for this profile
Biographical and contextual references in their original language. Sources and methodology.
Evidence for this profile
7 recorded claims · 7 without a claim-specific source. Context references do not by themselves verify every fact.
Dates (0/2 with a precise source)
- BirthPending review
1364
A precise source has not yet been added. - DeathPending review
1402
A precise source has not yet been added.
Family and relationships (0/2 with a precise source)
- FatherPending review
William II of Jülich
A precise source has not yet been added. - MotherPending review
Maria of Guelders, Duchess of Jülich
A precise source has not yet been added.
Governments (0/2 with a precise source)
- GovernmentPending review
Duke · Guelders · 1371–1379
A precise source has not yet been added. - GovernmentPending review
Duke · Guelders · 1379–1402
A precise source has not yet been added.
Successions (0/1 with a precise source)
- SuccessionPending review
Guelders · Reinald III of Guelders → William I of Guelders · 1371
William claimed Guelders through his mother Maria, sister of Reinald III. His position was disputed by Matilda, another of Reinald's sisters, until the conflict was resolved.A precise source has not yet been added.
Biographical and contextual references (2)
Editorial history
- 2026-10-12 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.
- 2026-10-08 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.
- 2026-10-04 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.
- 2026-10-04 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.
- 2026-10-03 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.
- 2026-09-30 · The duchy is limited to Dijon and Autun; each other fief now enters the map only under its dated ruler. John III of Namur and the Nevers/Rethel branch were added. The previous shape combined later counties and unrelated lands as if all belonged to the duchy from 1363.
- 2026-09-28 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.