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John I of Castile

He attempted to assert his rights to the Portuguese crown through his marriage to Beatrice. Defeat at Aljubarrota frustrated that project and consolidated the House of Aviz.

1358 – 1390King of Castile and LeónTrastámara · ES
Explore this family · Spanish AtlasBack to people

This complete profile is available in English. Bibliographic titles retain their original language. Links marked ES open the Spanish edition.

Historical profile

Key details

Birth: 24 August 1358 Documented

Death: 9 October 1390 Documented

Role: King of Castile and León

Dynasty: Trastámara · ES

Territories: Castile (ES) · León (ES)

Recorded governments and reigns
King · Castile · Reign Pending review1379–1390Effective rule
King · León · Reign Pending review1379–1390Effective rule
Family network

Recorded relationships

Parents
Partners
Children
Crowns and unions

Their titles over time

Follow the changing territories and offices of John I of Castile. Each title retains its own status.

Governments in 1379

  • Crown of Castile2 titles and offices
    View titles and jurisdictions

    Crown of Castile from 1230; the map retains the names Castile and León. Source for this grouping

Annual dates: overlap within one year does not prove that two offices were held on the same day. Regencies and co-rulerships retain their labels.

Documentation

Sources for this profile

Biographical and contextual references in their original language. Sources and methodology.

Evidence for this profile

7 recorded claims · 4 without a claim-specific source. Context references do not by themselves verify every fact.

Dates (2/2 with a precise source)
Family and relationships (1/3 with a precise source)
  • FatherDocumented

    Henry II of Castile

    The authority record identifies Henry II of Castile (GND 133968006) as father.
    Deutsche Nationalbibliothek · GND · Juan I., Castilla, Rey · Relationships: father → GND 133968006
    Reviewed on 2026-10-17 by El Árbol de Europa ·
  • MotherPending review

    Juana Manuel of Castile

    A precise source has not yet been added.
    No individual review recorded ·
  • Marriage or partnershipPending review

    Eleanor of Aragon

    A precise source has not yet been added.
    No individual review recorded ·
Governments (0/2 with a precise source)
  • GovernmentPending review

    King · Castile · 1379–1390

    A precise source has not yet been added.
    No individual review recorded ·
  • GovernmentPending review

    King · León · 1379–1390

    A precise source has not yet been added.
    No individual review recorded ·
Biographical and contextual references (3)
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.

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