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Afonso III of Portugal

«the Boulonnais»

His reign completed the Portuguese conquest of the Algarve. Territorial consolidation and the strengthening of royal authority coexisted with conflicts with the Church.

1210 – 1279King of PortugalPortuguese House of Burgundy · ES
Explore this family · Spanish AtlasBack to people
Portrait of Afonso III of Portugal
Historical representationAfonso III of PortugalUnidentified artist · Date unspecifiedPublic 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: 5 May 1210 Documented

Death: 16 February 1279 Documented

Role: King of Portugal

Other recorded names: Afonso the Boulonnais · Afonso of Boulogne · Alfonso III of Portugal

Dynasty: Portuguese House of Burgundy · ES

Territories: Portugal (ES)

Recorded governments and reigns
King · Portugal · Reign Pending review1248–1279Effective rule
Regent · Portugal · Regency Documented1245–1248RegencyVisitor and defender of the kingdom. Administrator appointed by the pope during Sancho II’s deposition. He adopted the royal title only in 1248; control was disputed during the civil war.
Family network

Recorded relationships

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 (0/1 with a precise source)
  • Marriage or partnershipPending review

    Beatrice of Castile

    A precise source has not yet been added.
    No individual review recorded ·
Governments (1/2 with a precise source)
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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