John I of Portugal

King of Portugal from 1385 to 1433

  • Fame56.2
  • Momentum0.5
  • Portugal rank#169
Source-basedStable
  • Fame56.2
  • Momentum0.5
  • Portugal rank#169
  • Wikipedia23.3K
Lived 1357–1433, aged 76Portugal
  • Wikipedia
    54 languages
    Cross-language footprint
  • Rank in Portugal
    #169
    Politicians
  • Era
    1357–1433
    Aged 76
  • Awards
    1
    recognised work
Summary
Updated 2026-06-08

He won a throne in battle against Castile, then held it for 48 years — longer than any Portuguese king before or since. That reign launched an empire.

Biography

About

John of Aviz was born 11 April 1357, illegitimate and unlikely. A succession crisis gave him his chance: he fought Castile for the crown and won, founding the Aviz dynasty in 1385. The victory preserved Portugal's independence when annexation loomed. His reign stretched to 1433, 48 years that saw the kingdom turn outward — the first moves of overseas expansion happened on his watch. He died 14 August 1433, remembered well enough at home to earn the name João de Boa Memória.

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By the numbers

Score breakdown

The six component signals behind the Fame score, and their ranks across the leaderboards.

Fame
Stable
56.2
Composite of search demand, mentions, audience & graph footprint.
Score components
Momentum0.5
Historical22.8
Now attention2.5
Source confidence60.0
Completeness70.0
Global rank
Country rank
#169
Category rank
Receipts

Sources

  • Wikipedia
    wikipedia · en.wikipedia.org
    High confidence
  • Wikidata
    wikidata · wikidata.org
    High confidence
  • Pantheon 2.0
    database · pantheon.world
    High confidence