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John I of Portugal

«of Good Memory»

Victory at Aljubarrota secured his crown and founded the Aviz dynasty. The conquest of Ceuta during his reign opened a new period of Portuguese expansion.

1357 – 1433King of PortugalAviz · ES
Explore this family · Spanish AtlasBack to people
Portrait of John I of Portugal
Historical portraitPortrait of John I of PortugalAnonymous artist · Fifteenth centuryMuseu Nacional de Arte Antiga, Lisbon · inv. 2006 PintPublic domain · PD-Art / PDM 1.0 · Source

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: 1357 Documented

Death: 1433 Documented

Role: King of Portugal

Other recorded names: John of Good Memory

Dynasty: Aviz · ES

Territories: Portugal (ES)

Recorded governments and reigns
King · Portugal · Reign Pending review1385–1433Effective rule
Family network

Recorded relationships

Parents
Partners
Children
Documentation

Sources for this profile

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

Evidence for this profile

5 recorded claims · 2 without a claim-specific source. Context references do not by themselves verify every fact.

Dates (2/2 with a precise source)
Family and relationships (1/2 with a precise source)
Governments (0/1 with a precise source)
  • GovernmentPending review

    King · Portugal · 1385–1433

    A precise source has not yet been added.
    No individual review recorded ·
Biographical and contextual references (4)
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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